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Chrysler Town and Country Stuck In A Lurch

Q. Hi. I have a 1994 Chrysler Town and Country mini van. 2WD, 6 cyl, 3.8L, multi-point fuel injection, 4-speed automatic transmission with lockup torque converter; 4 wheel power anti-lock brakes; front wheel drive with power steering; cruise control (did I get it all?) with 42,600 miles. Recently it began having two problems: stalling when I come to a stop, and hesitating and then lurching while I'm driving at constant speeds.

A local mechanic sprayed the throttle with Seafoam; this made the problem worse. I brought the car to the dealer who cleaned the throttle by taking it apart (he said the Seafoam is the worst - it can ruin the oxygen sensor), changed the throttle body gasket and air-cleaner filter, changed the spark plugs and wires, and gave it a tune up.

It now runs much better, but it still occasionally stalls when I'm at a light and lurches while I'm driving at a constant speed. It seems to be worst when the temperature is about 90 or above. I left it with the dealer again and he drove it for 40 miles with no problems ( it was a cool day). The only thing he could suggest was a new computer (for about $450) based on "secondary indicators which show PCM failure".

I didn't want to spend that yet since I'm wondering if it might be something much smaller causing the problem.

Is there anything that happens in particular when the weather is very hot? Does this sound like a common problem?

Thank you so much for any help you can offer,

A. This kind of driveability problem can be very difficult to track down, even more so since it's intermittent. Say you put the $450.00 PCM in at his suggestion and it doesn't solve the problem, will he give you a refund? If he agrees to that, then have him put it in and if it does indeed solve the problem, you're good to go. If not, then he's back to square one. If he does agree to this, then take it in when it's displaying the symptoms so he'll know if it is indeed fixed..

The only thing I can think of that happens in very hot weather is the fuel will have a tendency to get hot and begin to boil. Although this usually manifests itself when the engine is restarted hot, not usually while driving. Before I would commit to the PCM, I would have all the settings double checked and definitely eliminate everything else. It might be a good idea to take it to another shop for a second opinion.

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