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Car is a 1992 Pontiac Grand AM,six cylinder, 3300 engine, 68,000 miles. Last April or May while slowing down for a stop light at an intersecration, the engine suddley started "chugging" and quit completely. Put in park and turned key and car started immediately. Upon shifting it into drive the engine killed.This would continue for about five times before the car would finally continue running and I could drive on to my destination.I do not remember seeing "service engine soon" coming on. It did happen again some weeks later as I was slowing down for a stop sign. There was no regularity of it happening but the stress made me decide to go to a mechanic. The mechanic put in new plugs, fuel filter, air cleaner, said plugs were real bad and could not find anything else. I don't beleive he had all the computer equipment a full service would have.Cost $160.00. Several months after the June work, slowing for a light it killed again. Got it started just like before and drove a couple miles and it killed again at a light. Got it started agin and drove home. I put one bottle of fuel injector cleaner in the gas tank a while back. Another mechanic reffered to me said he would pull out the four pronged plug in the front of the transmission, (Lock Out) I beleive he called it, for this problem. It hasn't happened for a couple of months now. Still a problem I feel. Seems as if it always happened as I was slowing down for a stop sign or a traffic light. I would appreciate any help you can give me on this problem.

Answers from the Automotive Experts

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Joan, I would have the vehicle's transmission tested. Often times if it's not a shifting problem people don't think about the transmission. However, if there is a problem with the transmission it can put overdue stress on the engine causing it to stall out. Because you only notice it stalling when the car would be downshifting it makes the transmission suspect. Find a reputable transmission service center and explain everything to them like you did for us. They just might be able to solve your problem. To locate an ASE Blue Seal service center go here: http://www.ase.com/bluesealsearch/locator.php

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