Question about 1999 Pontiac Grand Prix
Go to any auto parts store and buy a can of maff sensor spray, and clean maf sensor. it can get dirt in it and make it mess up. follow directions on can. also make sure air filter is clean and free of dust and dirt. to remove it is in air flow from air cleaner box to throttle body . remove the hose then the wiring connector, then remove maf sensor for cleaning. let dry then reinstall. first dis connect maf sensor and if it is better then the maf is your problem. there are many things that cause backfiring, you may need proper equiptment to diagnose problem. you can try the coils they could be bad.
Posted on Jun 23, 2010
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Posted on Jan 02, 2017
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