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jasonsos 05-01-2012 05:47 PM

Greetings to all and HELP with odd miss-out!
Howdy to all Jeepsters!
I'm a new member as of today, 5/01/12. I will post a Bio of myself later on if that's all right, because right now I have a 'VERY' odd problem with my 2000 Grand Cherokee Laredo, 4.0 in-line 6 cylinder automatic with over-drive that neither my well trusted mechanic nor members of another forum I belong to can figure out: at a 55 mph stomp (floor-boarded) the over-drive (aka passing gear) kicks in, but just before it shifts out near 70--80 mph, there is a major 'miss out' like a power loss, or like if someone turns the key off--then quickly back on again, that is followed by a few regular kind of slight misses and then it shifts out into over-drive around 80 mph. *There are no dash warning lights (all are working though), and not more than 4 to 4.5 RPMs at the time of the major miss out before it shifts into over-drive.
* My mechanic and I both thought it could be one of the spark coils or an 'RPM regulator,' but it does not have this missing out from a dead stop floor boarding through 1st, 2nd and 3rd gears. It ONLY starts this odd missing between 55mph till it shifts without letting off on the pedal. And, that first miss is a 'MAJOR' bumping kind of miss.
Has anyone ever had this problem, and if so, would you please share what this problem is before we start throwing parts at it that this disabled Veteran can't afford? Thank you kindly. Jasonsos

Frango100 05-01-2012 06:30 PM

Re: Greetings to all and HELP with odd miss-out!
Howdy Jasonsos, welcome to the garage.
You could better ask this question as well in the WJ forum, you have more change to get some answers.
The check engine light is not on, is it? Did you check for any faults stored in the PCM using the key dance (ignition switch off/on-off/on-off/on and leave it in on. Now in the odometer display DONE will be shown when all ok, or any fault code.)

jasonsos 05-01-2012 08:16 PM

Re: Greetings to all and HELP with odd miss-out!
Hey! Thanks Frank! I'm glad to be here. To answer one question: nope; no warning/check engine lights at all, which was the first thing my 30 year Jeep mechanic asked. As for the 'faults in the PCM key dance,' ya lost me there. I suppose you are suggesting I try that? I'll do that, although I can relate that all LED lights are working, so no chance of a burnt out bulb. OK. I'll go do that on-off-on-off-on-off dance right now. Thanks again Frank. I didn't know I could post to the WJ forum. Thanks for that too. Jasonsos

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