In the manual there is some discussion on a "sudden pressure valve" [it is located right in front of the radiator overflow tank on the RH [passenger] fenderwell-- it has a 2 prong wire plug in on top and vacuum line out the bottom that goes to the top of the warm up regulator] .... manual says only on 1985 MY but for whatever reason I have one on my 1984.

Unplugged wire and shorted across and idle went to normal. Right now driving it that way until I get a replacement. I also had to plug off the warm up regulator vacuum line with a golf tee to get it to warm up.

Optimism is returning.

__________________
dloveless

1984 500 SEL [131K]-
1991 GMC Sierra 4X4 XC [162K]- War Pony.
2004 Jeep Liberty Limited [8k]- wife's sled- Belle.