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What could be wrong with a 98 Bonneville that runs really rough even after you have replaced plugs and wires?
Wiki User
∙ 13y ago
feul filter may be
Answerhave coils checked.. AnswerCHECK YOUR VACCUM HOSES. MAKE SURE THEY ARE NOT HARD OR CRACKED AnswerMy 93 was the same way. Had the injectors cleaned on a workbench style injector cleaner (ASNU) and it ran great afterwards. The shop provided before and after measurements from the flow of the injectors - the difference was huge!- The same thing happened to me 1998 and it turned out to be a cracked plug. I must have turned to hard while installing it.
You need to ensure that the spark plugs were all gaped to the manufactures measurements, also ensure that you have all the spark plug wires on in the appropiate locations.
I had the same problem also, it was caused by cracked plugs from being installed too tight and also a defective ignition coil.
Wiki User
∙ 13y ago
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