Grand Chero...problem

I have a 1996 Jeep Grand Cherokee, which I love, but it started doing the weirdest thing. It only happens when I have my A/C on, the speedometer will intermitently go wild, 30, to 140 to 55 to 0 back and forth, even if I am stopped and then it will also cause a hesitation in acceleration, bascially only when starting to move after being stopped, like at a stop light for example. It has even turned off on me once, when I pressed harder on the gas pedal instead of backing off for a second. It doesn't happen when the A/C is off. I have had the cables and wires checked, distributor cleaned, done a computer diagnostic which showed only that I had a faulty speedometer sensor or something so I had that changed as they figured that was the problem and it was shorting out something else..... but nope, it still is happening. I have it at the shop now and they are trying to work their magic but any info I could provide them would be a big help..... Thanks:wink:

You will probably get a better and quicker response if you post this message in the grand cherokee forum as this is for regular cherokee's. If I had to guess I would say look at the speed sensor, and possibly the throttle position sensor.

Thanks Dave.... I will post on the Grand Cherokee forum as well and I'll check with my mechanic and see if he has looked at those sensors. I live in Mexico..must look up the word for sensor...thanks again:)