I have a 88 cherokee runs great until warm. if left to idle rpms slowly get lower and lower until it finally dies. it appears to be loading up with fuel and starts to miss and has no power. pops and backfires when accerlarating. doesnt clear up until it has cooled but as soon as it warms up it does it again.
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check the O2 sensors in the exhaust manifold with a automotive meter not a code reader ,then trade it in for a diesel manual version as these are impressive but 4.7 litre gas guzler at our petrol prices about 10 dollars a gallon in the -uk and around 7/8 dollars here in spain this vehicle you couldnt give away here
yes it does if it is reading lets say lower than normal that would explain easy start up and stalling later.the coolant temp sensor has two wires .so if your car warms up and your coolant is about 200 degrees your coolant sensor might say 80 degrees .access to a scanner to check temp would be great.
Check and clean the IAC valve. Idle Control Valve. Use brake cleaner or carburater cleaner . Remove the duct work from the air filter assembly. It is located just inside . Run the engine at 1200 rpms and spray the valve. The valve can also be removed and cleaned.
Wow!!! Now that's a headfull of problems....
This could be a great many things...
Check these before you sell. I have a '93 Aerostar and can't live without it.
1. Check idle speed
2. Fuel filter may be clogged or water in the fuel system.
3. Choke improperly adjusted or sticking.
4. Distributor components damp or damaged.
5. Faulty emissions components.
6. Faulty or incorrectly gapped spark plugs/ Also check wires.
7. Vacuum leak at the carburetor/fuel injection unit or vacuum hoses.
8. On 1986 models, stalling during idle or deceleration may be caused by sludge in the throttlebody. (2.3 litre engine)
9. On 1986 & 1987 models with a 2.3 litre engine,hesitation or stalling during acceleration may be caused by carbon build-up on the intake valves.....I hope this helps!! Adios