Engine runs rough

THOMASMCBRIDEJR

MEMBER
1998 PONTIAC GRAND AM
3.1L
6 CYL
2WD
AUTOMATIC
124,000 MILES

Engine feels like it is missing when idling.

Saturday, September 12th, 2020 AT 6:16 PM

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 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

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Saturday, September 12th, 2020 AT 7:03 PM

THOMASMCBRIDEJR

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3 POSTS

Thank you for your advice, hopefully this will help resolve this problem. Tom.

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Sunday, September 13th, 2020 AT 5:55 AM

JACOBANDNICKOLAS

MECHANIC
109,755 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

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Sunday, September 13th, 2020 AT 7:37 PM

THOMASMCBRIDEJR

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3 POSTS

Have not found vacuum leak yet, still looking. Thanks, Tom

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Monday, September 14th, 2020 AT 12:52 PM

JACOBANDNICKOLAS

MECHANIC
109,755 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

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