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What is causing my 1997 Pontiac grand am 4cyl to run horrible

It backfires constantly, drops in speed no acceleration uphill if I push the accelerator it bogs out drops in Mph quickly feels like it might quit or start rolling backwards it just pop, pop, pops, theft system light on check engine light on solid but sometimes check eng light will flash while car is struggling also have to put it into neutral to start or it will just start & die but in neutral stays started usually

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  • Pontiac Master
  • 3,225 Answers

How long since a tune-up? Are there any applicable trouble codes? Some of the national brand auto stores will check codes for free. If you want to check codes, yourself, at the least, you need an obd2 code reader.

Does pop come from the exhaust or intake?

Posted on Nov 18, 2014

  • 1 more comment 
  • Michelle Nitsche
    Michelle Nitsche Nov 19, 2014

    I haven't had it checked

  • Michelle Nitsche
    Michelle Nitsche Nov 19, 2014

    I haven't had it checked

  • Michelle Nitsche
    Michelle Nitsche Nov 19, 2014

    i haven't had the codes checked yet & I believe the pop is coming from the intake possibly exhaust as well sometimes. it has also started to go through gas like crazy not sure when the plugs were last changed it also has 217,538 miles salvage title rebuilt in Washington in 2007 has a sticker says do not remove in the driverside door jam??

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Posted on Jan 02, 2017

SOURCE: Need help w/1998 Navigator

Coil Pack or coil packs are bad there is 1 for each spark plug

Posted on Sep 08, 2008

  • 51 Answers

SOURCE: hesitation at 40mph and 50 mph.

A pop and hesitation is likely a backfire. The hesitation around 40 and 50 would be in keeping with that theory. There are several reasons you might be getting backfires and hesitation. If your ECM is adjusting the engine to run too rich this could happen. Misfiring might be occuring. Timing could be out. But one of the most likely is a restricted exhaust, likely due to a plugged, damaged or worn out catalytic converter. In some cases the converter may be bad enough to be giving you some performance problems, but not yet quite bad enough to signal an error. A vacuum test can help confirm whether this is exhaust related.

Posted on Feb 07, 2009

udesh99
  • 97 Answers

SOURCE: Backfires in manifold on motor on acceleration. runs ok low speeds

Nornally reson for backfire is when intake Valve open Internal combustion in Cylinder. Pls Check Your Ignition Timing & Valve Timing. ( I think Your Timing Advancer is Defect )

Posted on Jun 01, 2009

motor1258
  • 6674 Answers

SOURCE: 2004 subaru forester, 99,000 miles. Check engine

Drop in to an Autozone, or Pep Boys, or similar big parts store & they will usually scan for codes free. This will hopefully eliminate all the guess work, or at least point everyone in right direction for better diagnosis. If not obvious from codes what the problem is, get back to us and we'll help you out.

Posted on Aug 23, 2009

Testimonial: "Thanks for the great suggestion . I'll have Autozone read the codes on Monday. Thanks again!"

  • 73 Answers

SOURCE: bogs down upon acceleration

You have coil over spark plug ignition and one of your coils is bad.You need to find the bad coil and replace it.

Posted on Aug 27, 2009

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