My 91 Saturn SC, DOHC, will start and idle ok foe about 1 min. then it "throws a fit" idles real rough, and blows black exhaust smoke. This does not seem to efect the running on the road, but it drinks gas. It will sometimes die, and has to be restarted like it has a carburator, with a stuck choke. I replaced the MAP sensor, but dont want to just throw parts at it. What could cause this prob.. HELP
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You might want to watch your coolant level. Open your radiator, fill it to full, and start the truck. If bubbles form, you might have a broken head gasket. Also, check to see how your water seperator and fuel filter are looking. But it sounds kind of like a head gasket.
signs of a bad fuel pressure regulator-- the vehicle will run rough, the engine will not start ( usually in the mornings,) many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. replacement is only cure. 1- black soot on plugs-2-black smoke from tailpipe-3- running rough-4- stalling, good-day! repost if need be.