Question about 1999 Jeep Wrangler

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99 TJ loads up badly..idles rough..400-1800 RPM..sounds cammed..

My 99 TJ w/ the 4.0 starts fine, after about 3-5 mins of idle it sounds like it begins to carb up and the RPMs will jump between roughly 400 - 1800. If I leave it run for about 10 mins it clears up and drives fine, but if I start to drive it before it clears up it will sputter(almost like a backfire) and will continue through about 2500 RPM then clear up until I shift into the next gear and so on. Ive cleaned the throttle body with CRC throttle body cleaner, as well as changed the IAC (the pin was black when I removed it). I have also changed the plugs, cap, and rotor. Haven't changed the wires but there aren't any signs of electrical arc. Ive also replaced the battery and alternator because they went one right after the other. Seems to run a little stronger with those replaced but thats neither here nor there. So, what could be causing this? I've heard TPS, bad cat, bad injector/injectors and "thats just the way they run" from different jeep guys but I'm running in circles. If it helps my friends 97 TJ w/ a 2.5 does the same thing..

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Mine was doing exactly what you described, changed out my TPS and ran like new again.

Posted on Nov 19, 2009

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Try a new mass air flow sensor

Posted on Oct 10, 2009

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