Rough idle - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-03-2013, 12:23 PM   #11
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I agree, you would probably do well with a full seafoam treatment and then full tuneup.

Also, keep in mind, I don't think series 1 knows how to throw a misfire code.
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Old 11-06-2013, 12:35 PM   #12
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Ok, here is my update,

I replaced plugs and wires, 02 sensor and air filter. Still have that stumbling/cutting out feeling.

Happen off and on in the 50-60MPH and sometimes as low as 40 and high as 65. Typically on a slow acceleration or uphill.

The stumbling at idle and take off (feels like the above) has stopped since I cleaned out the MAP sensor.

Any advice would be greatly appreciated.
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Old 11-06-2013, 01:09 PM   #13
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Is the check engine light lit and/or flashing?
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Old 11-06-2013, 01:19 PM   #14
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Use the procedure found on this link to see if there are any trouble codes stored:

2008 Acura (MDX) Sensor Location
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Old 11-06-2013, 01:22 PM   #15
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Thanks forgot to mention that there are no codes, no flashing CEL.

Also, it was mentioned that when I unplug the MAF with the engine running it should fall to a default setting. It stalled.
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Old 11-06-2013, 03:56 PM   #16
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Check the ignition coils as explained in this link:

https://www.gmforum.com/trouble-shoo...-wires-278818/

When is the last time you changed the fuel filter? If it has been a while, change it. If still no improvement you should get a gage and check fuel pressure at the fuel rail.

If coils and fuel pressure check out, you may have misfiring injectors. Run a top end cleaner into the intake like SeaFoam and see if things clear up.
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