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My 2001 Buick park avenue has a Mis-fire the code is p303 I changed spark plugs and wires I also changed all of the ignition coils what else should I do?
Terrysonnier
Auto Zone and some other auto parts stores have a diagnostic machine you can use for free, just ask someone at the counter.
Wiki User
∙ 14y ago
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Why do i have a Misfire after putting in new alternator?
"Misfiring" After Installation of a New AlternatorRemoval and replacement of an alternator should not causemisfiring of the engine.Either this is a coincidence, OR whoever changed the alternator inadvertently damaged the ignition wiring system.The "fix" for this problem is to have someone who knows what he/she is doing to fully troubleshoot the ignition system, identify the fault, and properly correct it.
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