I drive a 1992 Pontiac firebird. I have a 305 v8. My car for the past 2 months has been chugging. What happens is when I am driving my service engine light will come on and then a my mufflers will get really loud and then get really stiky and start chugging. It will chug sometimes until it dies but I can restart it most of the time. While my car is chugging it will also accelerate and deaccelerate on its own. My father and I have replaced the throttle postioning system, the m.a.p.s. sensor, carbarator, and spark plugs. My father and I are stumped on what could be causing the problem because it is still chugging and accelerating even after everything we have done. Any help on what it could be, would be awesome.

Asked by Nov 03, 2014 at 10:19 PM about the 1992 Pontiac Firebird Trans Am

Question type: Maintenance & Repair

3 Answers

32,915

Stinky as in rotten eggs? Catalytic Converter! You're describing all the classic signs.

Not rotten eggs, but a heavy gas smell.

18,310

Mark is probably right. However a 1992 shouldn't have a carburetor. It should be fuel injected. Check your fuel filter, fuel pressure regulator, fuel injectors but start with the cat. convertor(s). There may be more than one of them. You could have more than one of these problems at the same time.

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