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  1. Dear Cadillac friends. Posting from Stockholm, Sweden. Background: I inherited this car from my dad, he used to frequent this particular forum (and other Cadillac forums) quite alot before he got ill and "moved on". 94 STS, Car is in excellent condition, many new parts, ran like a champ up until end of September... Northstar engine. Rebuilt, (time sert) new headgaskets, new alternator etc, the works..Car ran great for a few years. Here´s what going on since last couple of weeks: Problem: At idle it goes up and down 800-1500 rpms. misses and chugs, comes down to 800, revs up again, misses chugs etc etc…. When I rev it to 2000 rpm and hold the throttle, it runs somewhat more smoothly, better. I let go of throttle,..back to idle chugging, misses and raises up / comes down.. No codes ! but SES light came on and flickered on/off while driving car for a day, but, does not lit up immediately when I start the car now. yey, it is Not drivable at the moment, have it at my shop/garage, Car is in exellent condition, many many spare parts laying around.( dad was a part time Cadillac mechanic) People have mentioned Vacuum leaks, and I have searched around quite abit, nothing found..Yet.. What I've changed / tried so far, giving no change, New Sparkplugs, wires, crank sensors, cam sensor, coil pack, fuel filter, tps sensor , egr valve. air filter, injectors. Map sensor. searched for vacuum leaks. unplugged brake booster, plugged hose, no change..Sprayed starting Fluid/brakecleen around hoses etc.., no noticeable change so far.. removed the whole intake manifold, installed new gaskets, reinstalled. cleaned Tbody. Sparkplugs look ok.. visually at least,they are about 1 year old.. Absolutely no change whatsoever with all these changes/parts !! If any of you guys have some ideas, please help ! Im good with wrenching, at a dead end with the trouble shooting, need input.. No codes, this is the annoying part.. Vaccum related ? electical ? whadda you think? Many thanks in advance, Olle