I own a 2005 pontiac grand prix sedan. The problem is that sometimes when i start my car it will take two or three times to start it until it stays running and sometimes when im driving its super boggy and then it just kicks in with full power and every so often it shifts hard.
Start with all the easy stuff. Make sure your maintenance is up to date. check all fluid levels and then filters -- especially fuel filter air fitler and spark plugs. If you have a check engine light on, then have the codes checked and make a plan depending on what codes come up --
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