bad mpg

  1. J

    Loud rattling noise

    My 99' Grand Am SE has been having some issues. Firstly, my car countinues to misfire. It misfires intermittently in cylinder 4 (P0304). The problem does not lie in any of the following: fuel injector, spark plug boots or spark plugs. I don't know what it is. But just today, my car has been...
  2. J

    1999 Pontiac Grand AM SE misfire/bad mpg

    I am the owner of a 1999 Pontiac Grand AM SE with 189xxx miles. When I am driving around 55mph @ 1600rpms, my motor will randomly jump up to around 2100rpms. I have gotten the P0304 misfire code. I took it to my trusted mechanic and they replaced the spark plugs and the spark plug boots. The...
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