random rough idle at hot and cold startups

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, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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omargadea12
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Posts: 11
Joined: Wed Nov 26, 2014 2:01 pm
Year and Trim: 95 Pontiac SSEI Supercharged 3.8L

random rough idle at hot and cold startups

Post by omargadea12 »

Hey guys, after a warm run car idles rough when I start it, does shut off sometimes. Does it rarely after overnight startup too. I tried searching some of the posts, no luck. Thinking egr valve. Any ideas, thanks.
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96 SSEi
Posts like a Northstar
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Posts: 1813
Joined: Sun Aug 22, 2010 11:11 pm
Year and Trim: 2000 Bonniville SSEi L67
Location: Ontario, Canada

Re: random rough idle at hot and cold startups

Post by 96 SSEi »

hi, are you throwing any codes? is the check engine light on dash?
just for giggles, please unplug the MAF sensor and see if it improves
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am
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nos4blood70
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Joined: Mon May 10, 2010 6:11 pm
Year and Trim: 2003 SLE
Location: Chicago, IL

Re: random rough idle at hot and cold startups

Post by nos4blood70 »

Fuel pressure regulator might be another possibility.
-Car Guy Carl
"Penelope" - 2003 SLE - 250k Miles
"Sydney" - 2000 Honda S2000 - 101k miles
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