Question about 1999 Jeep Grand Cherokee

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High Idle and sputters while driving....

Whenerever i start my car the rpms shoot up between 1 and 2 grand and slowly steady out but you can feel the car slowly rev up.... You put it in gear and try to drive off and it sputters and will continue doing it going down the road. Ive had the AIC replaced as well as fuel filter and new sparkplugs and a few months ago the TPS. Driving home tonight I turned the air off and it seemed to run fine with no problems and that seems unusual to me. Any Ideas??? Ive had it on two computers and no codes show or anything.

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  • 109 Answers

1st off if check engine light is not on then there will be any codes to check.... however you have a problem that is not being picked up by your computer... so u may have a vac leak... more air into engine makes rpms go up...

Posted on May 15, 2017

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Posted on Jan 02, 2017

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SOURCE: jeep wrangler stalls out

check idle air control, tps & map sensor. As usual with electronics, test test test before buying anything/

Posted on Feb 18, 2009

crayzeetrayn
  • 837 Answers

SOURCE: 2001 Jeep Grand Cherokee code P1391

I would check to be sure that the timing chain hasn't jumped at all ..

Posted on Mar 25, 2009

  • 1 Answer

SOURCE: 2004 jeep grand cherokee idling problem. Revs motor 200 to 500 rpms higher while driving.

I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.

Posted on Jun 01, 2009

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SOURCE: 2002 jeep grand cherokee 4.0 liter irregular idle.

You haven't changed everything...map sensor controls spark and fuel mixture as does the throttle position sensor, also check the idle control valve...Don't just buy stuff...do testing first.

Posted on Sep 06, 2009

motor1258
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SOURCE: 1998 jeep wrangler fuel filter issue?

Think I'd consider maybe replacing IAT sensor (intake air temperature sensor) , and cleaning the IAC motor before all that. The IAT basically tells the PCM what's going on temperature wise at the intake manifold, thus if it gives same reading when engine cold & needs more fuel, as it does once engine is warmed up, then you will experience the symptoms you are experiencing now. The IAC motor can be removed and spray cleaned with throttle body cleaner, (watch your eyes & hands) as well as spray into port you remove it from, as this may not be the cause, but may contribute, but if it were me, I'd change IAT sensor first & see what happens. If your mechanics want to change your fuel pump, tell them to test fuel pressure when first started cold and symptoms would be present, then test again after engine warmed up & running good. There should be a difference, as in lower pressure when cold. If once it's warmed up & you can accelerate well down the highway and experience no cutting out or bogging down as when cold, then I don't see why they are so sure it's fuel pump because it would do it then as well?

Posted on Sep 08, 2009

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1 Answer

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When i push the throttle, the rpms rise very slowly. also, when driving the car will sputter and shake. when at idle, the car idles very rough


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