So I have a 98 jeep xj with a 4.0. I have had it since about 160,xxx miles and it now has 180,xxx miles. Last night the check engine light came on and it began to sputter and feel like it was running without a sparkplug or something. I had it scanned at Auto Zone and both 02 sensors were pulling up as bad. I replaced the spark plugs and catalytic converter about 20k miles ago. Today I replaced the Spark plug wires and both o2 sensors because of the reading. I reset the computer by disconnecting the battery, it ran fine for about 10 mins. then once again it began to sputter and backfire. The check engine light is back on once again and its running rough again. I also just ran some fuel injector cleaner though it with, no luck at all.

Please give me your input, I just dont want to keep spending $ and not solving anything at all.

 

TPS sensor...IAC sensor sounds more like it. Clean your throttle body and IAC sensor really good that might solve your problem. Spend 10 bucks in carb cleaner and about a half hour cleaning. Id rather do that over spending 40-50 bucks for a new IAC.

 

I'm no help except, if you post your exact codes I think there is a better chance someone here could offer a suggestion. Good luck!

 

Turns out after I got it scanned again, that it was just a 10amp fuse under the hood that was blown and making the computer think that the o2 sensors were bad and causing to run lean.