Newly rebuilt engine and TPS and Distibutor.
The overheating could be causing the backfires as the engine gets too hot
over heating can be due to thermostat being stuck in closed position.
cooler fan not running, or blockage of air getting through the radiator. not enough coolant water in the system, or some other blockage in the cooling system. also using the wrong fuel such as race fuels can cause engines to overheat and or not run smoothly.
I hope this helps.
SOURCE: 1998 Jeep Wrangler Sport codes P0121 and P0122
did you check voltage to sensors if you need help with proedure, contact me, or you may try patrs houses on line in how to section.
SOURCE: 97 jeep wrangler 2.5 running lean
check fuel pressure and check exhaust for leaks. exhaust leaks caqn play with the o2 sensor readings
SOURCE: 1997 Jeep Grand Cherokee. Stalls out,engine quits running
since its a 1997 your jeep has EFI, electronic fuel injection. The most probable reason for your troubles would be the injectors or a problem with the computer controling them, not allowing enough gas to be pushed into the cylinder causing stalling or lack of power, also too much gas iin the cylinder can lead to back firing and stalling. This would also explain the reason it takes so long to start back up some times, all the excess gas in the cylinder is flooding the motor and u have to wait till the gas disipates till the engine will turn over.
SOURCE: 95 jeep wrangler splutters, jerks, backfires during acceleration
The ECU controls all of that. When they start to go bad they do very strange things that are hard to diagnose. They run about $300 bucks of you do it yourself. They are simple to do. Shop around because it is an electrical component and many places wont warranty them but some places do if your lucky you can find one. I also would not rule out your timing or distributor. I dont know you or what you have checked but could be the rotor or could be carbon tracking inside the distributor. Even the slightest crack in the cap can mess everthing up.
SOURCE: Need the Vacuum Diagram for a 1988 Jeep Wrangler 4.2 liter
try chiltons I got the haynes and the diagram is too hard to follow
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