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hope someone can help. my mom has a 94 regal, 3.1 multiport,she bought it new,it now has just over 100,000 on it. starts up no problem, runs and idles great until warm, then it will just stall. if at a light, it will stall, if driving say at 55 it will just cut out and if you let off the gas a little its ok. it may run ok for a bit even when warm, but it will consistantly stall or "buck" at some point , but "only" when warm. the "service engine soon" light comes on about 10 seconds after startup. i checked self-diagnostic computer for codes and all i get is a code 12 over and over. i was told that means "all clear" so to speak. so far i have replaced the o2 sensor, temp sensor{ next to tstat} did the "idle relearn" procedure,which i read about here, and checked fuel pressure with a gauge , which according to "chilton" should be 41-47 psi. when you first key ignition it reads 45 and when running drops to 40 and holds consistant at 40, even when she stalls out. also i just flushed cooling system, replaced tsat and antifreeze. i have a new knock sensor for it but cannot locate where it goes. i thought on the block somewhere but i cant see it.i dont know if its relavent, but both cooling fans come on when jumpimg computer to check codes, but when running and it comes up to temp, only 1 fan comes on?? please help, have to fix this for mom.
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