I have a 2003 Grand Caravan 3.8 that misses, smokes and barely stays running. Two weeks ago it did the same and had a broken valve spring. I fixed that and it ran great and it started doing it again. I have since checked all the valve springs (all good), compression is good, replaced plugs, plug wires, and coil pack. TPS tested good. My next thing on my list is cam and crank sensors. I had to order the cam sensor so it won't be here until tomorrow.

I have the crank sensor, but can't seem to find where it is located? Anyone have an idea?

 

its in the same spot at your 2 other posts on the trans above the differential.