i have a 93 regal that misfires - at least that's what i assume it's called when i hear tail pipe explosions and smell as if you're lighting matches. no smoke. the engine rpm varies a lot and sometimes cuts off. the whole car is shaking like one of those adventure rides!
it has done this twice in the past couple of weeks when i start it after a few days of sitting there. the strange thing is that it goes away after a few minutes of running or at the next start after it cuts off. so it's driving nicely as usually after the initial fits. it's not doing this while driving at least not yet.
last oil change was about 400 miles and about 2 months back.
i pulled the wires going to the coils and it's sparking so they appear fine. it's the same gas tank on both occasions (more than half used) - not driving the regal more than a few miles a week.
so i'm wondering is it dirt in the gas or a problem with the gas filter/pump? or could it be the oxygen sensor or smth else?
3.8 engine, 151000 miles - blinks code 17 when connected to A/B.
any help is appreciated!