Sorry to raise an old and tender subject with many. But I need clarification regarding a possible solution found elsewhere on Allpar.
This involves the dreaded random stalling on Caravans, Voyagers, etc. Mine is 1988 model with 3.0L. My set of symptoms are similar as reported by others - random stalling only once in awhile, restarts immediately (or if at highway speed may restart itself while still moving), not related to cold starts or stalls when approaching a stop. And NO codes are set. I only read a 55 when I check; the "last message" marker. Happens at highway speed and also when toodling along at 25 mph. I do note, however, that it seems to happen when I "coast", taking my foot off the accelerator for a moment. This makes the following seem significant.
I note the interesting description by Ron Wirth at this page (scroll down somewhat)..... http://www.allpar.com/mopar/3.html
...... wherein he relates that a sharp mechanic knew about this problem and discovered that it had to do, at least in some cases, with a sticking "fast idle servo" in the throttle body. It seems that the clearance in there is very tight in the cone valve area. Small deposits build up in there, smog particles or dust perhaps, facilitated by changes in humidity and temperature, which can cause a subtle and random sticking.
I've read quite a number of posts about the MAP sensor and crank sensor, and those are on my list. Also the ASD relay. I've already verified fuel pressure and because of a previously bad fuel pump years ago that could not maintain pressure under demand, I've replaced my pump again, even though the former one is probably OK (will keep for spare).
First though, I'm game to try cleaning that item that Ron mentions, but I need some clarification. I cannot find a manual reference to a "fast idle servo". I think this means the AIS motor or something else related to idle control, but Ron mentions that one should be careful to not get solvent on the motor itself, and not to just spray solvent into the intake which can cause problems with the idle speed controller. Just clean the "fast idle servo" in the throttle body. Do I interpret this correctly to mean removal of the AIS motor (two bolts and watch that the O-ring doesn't come off!), clean the orifice in the throttle body and then reassemble? If not, can someone clarify the idle speed controller parts/function/location on or near the throttle body? Or if someone knows how to contact Ron Wirth could you get him to clarify? Thanks to all.