The WitchHunter Experiment is on.
The Caravan has 140,000 miles and at least five of the injectors are original. I didn't want the Caravan downed for a couple weeks while the injectors were in work, so I went to the junk yard and relieved a similar (except for the bashed fender) 3.8L Caravan of its injectors ($4.50/ea.) and sent them. When they get back, I'm going to do a major tune up. A tune up on a 3.8L Caravan involves taking half the engine apart, so I'm arranging it so that I can take it apart and put it together all at one time. Remanned injectors, plugs, wires, pcv valve, and hopefully, the upstream O2 sensor. Sure hope this helps.