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Hi i have a 1989 trans am gta and had started to run real rough back fireing and not accelorrating

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  • Pontiac Master
  • 7,795 Answers

Symptoms indicate timing chain has skipped a link.

Posted on Aug 25, 2010

  • royalbanks10 Aug 25, 2010

    is this a common problem with the 350 tpi.

  • Jeff Turcotte
    Jeff Turcotte Aug 25, 2010

    Not sure--I don't see a lot of traffic online, but backfire is a pretty sure sign of valve timing issue--unless you have recently changed plugs and might have got the firing order off. I would double check firing order before pulling timing cover. Loss of power can have many causes, two of which are timing chain and firing order. Others are valve/piston damage, which we hope you don't have.

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