Getting obd code PO171

What is year--make--model? Any applicable trouble codes? So your having trouble with idle? Remove throttle body, clean throttle bore and any small passages. Check and clean anything that has to do with idle air system.

Have scanned for codes could be the tps throttle position sensor. If you have a rough idling could be IAC idle air control valve.

How To Fix P0300 random misfire codes in your car ...

? 2:56
https://www.youtube.com/watch?v=OyvdWeyDHf4
Feb 5, 2010 - Uploaded by Scotty Kilmer
Scotty Kilmer, mechanic for the last 46 years and counting, shows how to fix your car if the check engine light ...

P0300 - OBD-II Trouble Code - RepairPal

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OBD II Fault Code. OBD II P0300. Fault Code Definition. Random, Multiple MisfireDetected. Symptoms. Check Engine Light flashing; Rough running, hesitation ...

P0300 - Check Engine Light Diagnostic Trouble Code ...

https://www.engine-light-help.com/P0300-check-engine-light.html

The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the ...

Random-Misfire Page

www.random-misfire.com/

How about a blocked exhaust converter

They only last 12 to 14 years, under perfect
fuel trim conditions, with no misfires & you have
those or did

You changed the fuel filter & checked pressure at the motor?

IAC-Idle air control--so no--idle control is not your problem

All of the codes you are getting except for one are indicating a running lean condition. This is most likely due to a vacuum leak or the pintle on the egr valve is worn out allowing exhaust gases to pass through all the time. If you have access to a monitor check the iac duty cycle as well as the dpfe sensor. If the iac is reading less than forty percent you have a vacuum leak. As well if the dpfe is reading above 1.13 volts the egr valve is bypassing. The last code you have is being caused by a faulty thermostat.

on dodge motors
fitted a lot of parts and still no better

the fault code clears and comes back as a intermittent problem

could be electrical voltage drop off or heat related failure

i wonder if your 02 sensor ,the catalytic converter
or other related sensors
are causing the fault to come back
if needed .....fit a new air filter...

how the test is determined

P1294-TARGET IDLE NOT REACHED 3.3L/3.8L
When Monitored and Set Condition:
P1294-TARGET IDLE NOT REACHED 3.3L/3.8L
When Monitored: With the engine idling and the transmission in drive, if automatic.
There must not be a MAP sensor trouble code or a Throttle Position Sensor trouble code.
Set Condition: The engine idle is not within 200 rpm above or 100 rpm below the target
idle for 40 seconds. One trip fault.

POSSIBLE CAUSES
INTERMITTENT CONDITION
IAC MOTOR PASSAGES
VACUUM LEAKS
AIR INDUCTION SYSTEM
THROTTLE BODY AND THROTTLE LINKAGE
TEST ACTION APPLICABILITY

Electronic Engine Controls WARNING
To avoid personal injury and/or vehicle damage, refer to the service precautions at the beginning of this section.
General Information The Engine Management System (EMS) uses several different sensors and actuators to gather and control various emissions and driveability aspects of the vehicle. These may include but are not limited to:

• MAP - Manifold Absolute Pressure Sensor
• BARO - Barometric Pressure Sensor
• FTP - Fuel Tank Pressure Sensor
• ECT - Engine Coolant Temperature Sensor
• A/F - Air Fuel Ratio Sensor
• APP - Accelerator Pedal Position Sensor
• CKP - Crankshaft Position Sensor
• CMP - Camshaft Position Sensor
• EGR Valve Position - Exhaust Gas Recirculation Valve Position Sensor
• HO 2S - Heated Oxygen Sensor
• IAC - Idle Air Control Valve
• IAT - Intake Air Temperature Sensor
• KS - Knock Sensor
• MAF - Mass Air Flow Sensor
• TP - Throttle Position Sensor

---
Are there any codes that point to a problem with any of the above sensors?

The idle air control valve (IAC) may be stuck or failing. This solenoid-type device controls the airflow into the engine at idle. It is fed control input signals from the engine's computer. Over time, the IAC valve may become dirty from EGR gases and carbon, etc. It may have a worn pintle (valve head) or the return spring may be weak or broken, causing a rough idle or even stalling from an over-rich fuel/air mixture. The second thing to have checked is the throttle position sensor.TPS. These devices will "flag" a fault on your vehicle's onboard OBD-II computer, which a decent code reader/scanner can display and clear. Third, a dirty throttle body housing/venturi can cause rough idling and poor response. A special cleaner is needed to remove oil and carbon residues from the specially-coated inner surfaces of the throttle body. Fourth; you may have a Mass Airflow Sensor (MAF) that might be failing/malfunctioning. Some vehicles use these instead of the Manifold Absolute Pressure (MAP) Sensor, which you may have. These sensors need to be checked and verified that they are functioning properly. Fifth; check/change your vehicle's fuel filter, and verify proper/adequate fuel pump pressure and flow performance. Don't run your vehicle below 1/4 tank of fuel...doing this sharply reduces the life and cooling of the in-tank electric fuel pump. These are not cheap, or easy to replace!

Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

Check EGR valve. Also check all injector pulses with NOID light especially when vehicle is stumbling. It may be computer related. Get back to me if you need more help. Good Luck