post #1 of Old 01-25-2012, 08:28 AM Thread Starter
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Join Date: Jan 2012
Location: Las Vegas
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RPM Fluctuates/Stalls @ Red Lights and Stop on Hills

Hi, I have a 1997 Grand Cherokee Orvis v8 automatic. I love this thing, but lately it's been having the following problems: 1. RPM will fluctuate at 300 RPMs when @ a stop, 2. On hills, it will tend to move back, 3. A really bad vibration from underneath when @ a stop, 4. When I start to accelerate from a green light, it will not move right away for a about a second, it will sort of jump, then shift to first gear finally, 5. Then finally lately at a stop light, the RPM will fluctuate at 300 RPMs, then will stop and I would have to put the Jeep in park and restart the Jeep to get going again. Those are the issues I have and I'm not really sure what's going on. I heard about changing the PCM or maybe it could be my transmission, but after looking at the trans fluid from the dip stick, it looks normal. If i'm on the freeway or as long as I'm moving the jeep is fine, it will not stall and run normal. I'm not the most educated on vehicle mechanics, but I'll give anything a try. Does anyone have any ideas please or fixes I can try? Thank you very much.

anthonyf105 is offline  
post #2 of Old 01-25-2012, 08:30 AM
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1998 ZJ 
Join Date: Nov 2011
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Could be a clog cat
Snap-on is offline  
post #3 of Old 01-25-2012, 08:35 AM
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1998 ZJ 
Join Date: Mar 2011
Location: riverhead
Posts: 384
AIC or TPS sensor maybe. clean throttle body& iac if black
jr4x4 is offline  
post #4 of Old 01-25-2012, 05:26 PM Thread Starter
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Thanks. I'll give it a shot.
anthonyf105 is offline  

pcm , repair , rpms , shift , transmission

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