longtime GM user

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Question Asked: Slight rough idle. RPMs fluctuate 150± sometimes. Surges at highway speeds.
February 16, 2012, 08:35 AM
Vehicle has 121,000 miles on it. Local Oil change service company said CAM timing sensors were bad. No codes on then or now. They just thought that would be the fault. Took it to Buick dealer and replaced plugs and wires and ran BG fuel treatment through sytem. Did not replace CAM sensors. Surge going down interstate is only slight, like moving gas pedal back and forth. Rough idle is very slight at stops but can vary in degree. Dealer drove vehicle with computer attached and found nothing. They said one time while idling in shop, engine stumbled slightly but not enough for computer to register it as an engine misfire. Technician thought it may be slight injector misspray on cylinder 5. Put full tank of premium gas and some Sea Foam in (1 oz per gallon). Been running this for a week now and no improvement. I suspect a bad Oxygen sensor or possibly fuel injector. I haven't replaced fuel filter in a while but it doesn't seem to be a fuel supply problem. Not sure if Dealer checked fuel pressure. If there is a vacuum leak I haven't found one unless it is very small. Sitting at idle, the RPMs fluctuate slightly maybe 100 to 200 RPMs on the tachometer.
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Problem Reported: Check Engine Light Due to Gas Cap Issue
September 15, 2010, 10:07 PM
<p>Illumination of the&nbsp;<a class="ct_auto care advice tooltip" href="/symptoms/check-engine-light"><span class="ct_how_to tooltip">Check Engine Light</span></a> can be caused by a loose or worn gas cap.</p>
Problem Reported: Front Brake Rotor Wear Can Cause Pulsations
September 15, 2010, 10:06 PM
<p>Front <a id="ce_5551" class="ct_glossary tooltip" href="/brake-rotor">brake rotors</a> can wear causing a pulsation felt in the brake pedal. Our technicians often recommend replacement of the front rotors and <a id="ce_5550" class="ct_selected tooltip" href="/brake-pads">brake pads</a> as the best option to correct this condition.</p>
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