engine runs rough

1998 PONTIAC GRAND AM
124,000 MILES • 3.1L • 6 CYL • 2WD • AUTOMATIC
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THOMASMCBRIDEJR
  • MEMBER
  • 3 POSTS
engine feels like it is missing when idling.
Sep 12, 2020 at 11:16 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

If the check engine light is staying on or flashing, you should start by having the computer scanned for diagnostic trouble codes. Most parts stores will do it free of charge.

If the light isn't on, start by checking for engine vacuum leaks. Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know if you have already checked for codes. Also, let me know if you have other questions.

Take care,
Joe
Sep 12, 2020 at 12:03 PM
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THOMASMCBRIDEJR
  • MEMBER
  • 3 POSTS
Thank you for your advice, hopefully this will help resolve this problem. Tom.
Sep 12, 2020 at 10:55 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi Tom,

You are very welcome. If you have a chance, let me know what you find or if you have other questions.

Take care,
Joe
Sep 13, 2020 at 12:37 PM
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THOMASMCBRIDEJR
  • MEMBER
  • 3 POSTS
Have not found vacuum leak yet, still looking. Thanks, Tom
Sep 14, 2020 at 5:52 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Tom,

When you check for the leak, pay special attention around the intake manifold gasket. They are known to leak. Note there is an upper and a lower intake. The only pic I could find was the intake being removed. I highlighted the areas to check.

Let me know.
Joe
Sep 14, 2020 at 11:53 AM
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