Question about 1990 Pontiac Grand Prix

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Hi, my name is Alan,I have a 1990 Pontiac Grand Prix 3.1v6. A few months ago I changed the spark plugs, Fuel filter & ran some Sea Foam through the tank. Recently the car has been idleing rough & now sometimes will not start. OBD test gave no codes.

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If the car ran good before you put that sea foam in the tank, there's your problem. I haven't heard one good report about that junk, some swear by it, I've always used that techron injection cleaner, and never had any complaints.

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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