Mechanics

MY CAR KEEP BACK FIRING

1993 Cadillac El Dorado • V8 FWD Automatic • 100,310 miles

My 1993 Cadillac Eldorado keeps back firing when I step on the gas and it sounds like something wrong with the muffler pluss it reads service engine soon and a/c compressor is off also what should I do?/ What's wrong with my car? Somone said it's a piston losing preasure and another said it's a fuel filter inside the tank and or sparkplug
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Jtaylor
December 16, 2010.



Is it backfiring through the intake? Is it a northstar or 4.9l. The fuel filter is not in the tank.

Factoryjack
Jan 22, 2011.