You have big problems here, I suggest you go to the provided links and read about these fault codes and then hire a good technician.
Ford P0171 P0174 Lean Codes
P0172 OBD II Trouble Code System Too Rich Bank 1 YourMechanic Advice
https://www.obd-codes.com/p0175
P0304 OBD II Trouble Code Cylinder 4 Misfire Detected YourMechanic Advice
SOURCE: Ford Windstar 1996 Trouble Codes P0171, P0141, P0161, and P0174
Bank one is toward the front of the vehicle. Sounds like the heated oxygen sensors have gone bad. The Oxygen Sensors are located in the exhaust pipe and require a special socket to remove and replace.
SOURCE: p0171
I would assume that it has no vac leaks since you took off and put back on the manifolds. I would check the mass air flow sensor to see it is dirty. If it is clean it.
SOURCE: Check Engine light is on my 1997 F150 with a small
those codes are for lean engine condition look for vac leaks at the back of engine to the pcv valve could hear hissing noise with engine running also check egr valve to be stuck open also when was last fuel filter changed? hope this helps .
Testimonial: "I changed the PVC valve and the filter filter and was able to reset the codes. So far so good! Thanks a million."
SOURCE: I have a ford windstar 2001 lx there are four code's i need info
#1 is the egr position sensor #4 Is for single cylinder misfire so this could be the coil or a bad plug or wire ..but with fords should check for a vacume leak that can cause a misfire to .....#2#3 are 02 sensors before i would change them i would check the mass air flow sensor ..Hope this helps
SOURCE: 05 ford ranger with code p0174 lean on bank 2 fuel
When you fix the lean reporting,your long term
will come down
Vacuum Leak
Worn Out Sensor
Or 15 other issues
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