Hey, I just had the same rpm surging problem... really bad all of a sudden over the last couple days. The check engine light came on today and it's idle changed from big time shaking to barely a pulse. Drove okay on the highway on our way to my favorite auto repair. A diagnostic showed that the third spark was dead and upon the advice of a senior mechanic - spark plugs were changed along with the coil. I dunno if that was smart on my part I could have tried just the plugs first. But I figured I have never changed any of these before and it is getting older. So with a new coil, spark plugs and minus $375 from my world - ... but it's running pretty well now.
I had the same problem and I found out that the battery was bad. since everything runs off the computer there wasnt enough juice to run both the car and the computer the jeep ran good after putting a new battery in it. so try this first before you spend a lot of money on a shop fix because they wont think about the battery being bad. they will want to replace everything but. hope this helps
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I have the same problem with my jeep. Have changed plugs and 1 fuel injector. it ran good for about a day then check engin light came back on. took it in and the guy checked the code and said he had never seen that many codes. now it wont idle at times it will even die going around corners wich is not good because you lose steering when the engine dies.
Just bought a 2000 cherokee laredo v8. Having the same surge problems.
Sometimes at a stop the rpm's surge back and forth between 500 and 1500 rpm's and sometime the engine will die.. Today the check engine light came on...now it's back off??
I've read on-line that it could be the oxygen senors??
the rpm is doesnt return to a normal position when car is not move. than pressing benzine pedal may stops but maybe not. is it possible to repair or need change spare parts.
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