Need your help Guys. I have a 02 Caravan, 3.3L Flex,139k miles. Great Vehicle, up till now. 4 weeks ago it bogged down on freeway and eventually shut off.Check engine light was on. Had it towed to a Cert. Mech. He said it needed a "major" tune-up and I said go ahead. His invoice said he replaced: Coilpak, plugs, plug wires, Cam sensor, crank sensor, fuel filter. It still didn't run right and he suggested a PCM replacement. After choking on the estimate, I paid his invoice, and decided to let Mech #2 have a crack at it.He also replaced the coil pak again. He actually replaced the PCM with a "rebuilt" one and replaced a PCV valve also. It is running OK, BUT....at a complete stop,after driving it, it will misfire. 3-6 times. It doesnt do it when driving, only at idle when in gear,and there is no check engine light on. I'm trying to sell this , so I can recoupe the $1200 it cost me to fix, but it misfires very randomly, I don't know where to go next.....Any gurus out there?