Rough idle

2003 OLDSMOBILE BRAVADA
200,000 MILES • 6 CYL • AWD • AUTOMATIC
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BAMBAM187
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  • 2 POSTS
Well, I changed the plugs now it has a rough idle. I do not know what to do. I have tried to reset the system it is not working. I have checked all the plugs make sure everything was connected right, it still runs rough.
Mar 12, 2017 at 7:02 AM
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HMAC300
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sometimes new plugs do that. drive it for a few miles see if it straightens out. then check your plug wires and for a vacuum leak.
Mar 12, 2017 at 8:35 AM
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BAMBAM187
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I have done that drove it sixty miles no change.
Mar 12, 2017 at 9:32 AM
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HMAC300
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okay, check for a vacuum leak and check fuel pressure with a gauge auto parts rent that. should be 60-66 psi with lower number minimum also should hold with in 10 psi for five minutes at least.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Mar 12, 2017 at 9:47 AM