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sounds like your air intake gasket is leaking. If you take ether, or brake cleaner and spray it where the air intake is bolted on, the idle will come down to normal. Is this problem existing even after the engine is warmed up, or just when you first start it up?
Change the temperature control sensor to the front if the engine near radiator 1 start the truck let it run till you think it is at normal operating temperature 2 unplug the temp sensor if the idle changes then the sensor is bad
Yes, it is normal for a vehicles idle to be high when first starting up, no mater what the temp. If it`s already warmed up to operating temp, it will still have a high idle for a brief moment when starting. Usually this is the IAT (Intake Air Temperature) sensor. Located in the air duct down from the air filter, and before the throttle body.
Main proplems from IAT sensors are to low of an idle at normal temp, or the idle never comes down after warm up.
Your gas milage problems would stem from Oxygen sensors, plugs, wires, timing, etc...
Here is a quick test, just incase your OBD II (Computer, PCM..) memory module is not working properly. With the engine running, using the tips of your fingers, tap on the PCM, if the engine stumbles or stalls and sends troubles codes that light up your check engine light while tapping, if it does, check to make sure all wires are securely attached to it.
check all your vacuum hoses and the throttle body itself for a vacuum leaks if the hoses replace as nessasary if to check for throttle body get can of carb cleaner and spray around base of throttle body and sides not in it if idle raises you have a vacuum leak goto a good parts store and ask for a rebuild kit don't goto auto zone or advance they don't carry them
i strongly suspect a vacuum leak.. check for disconnected hoses or intake area leaking by spraying carb cleaner around those areas while idling.. if engine personality changes you are close
It sounds like you have a leak somewhere in your intake manifold. Have all hoses and seals checked. If the idle air control valve is malfunctioning it would cause the engine to idle high even after the engine is warmed up. Have it checked also.
The high idle is caused by the choke and the high idle on the carb. It is working normal and you do won't to warm up this motor before going. When it is warm and you hit the gas it activates the choke pull off to bring the idle to normal. Your mechanic is used to fuel injection that will control the fuel/air mix according to temp. I still let my injected cars warm up so the oil can thin a little. If you jump on the highway with cold thick oil it can all wind up in the to of the motor.
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