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1991 GMC 5.7L V8 idle problems Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting Guest Anonymous Poster pmkrod@live.com Jun 23, 2008, 12:13 PM Post #1 of 3 (4904 views) 1991 GMC 5.7L V8 idle problems Sign In Need help. My '91 GMC Sierra is having issues. I've replaced the idle sensor, throttle body gasket, ERG sensor / valve, vacuum lines, plugs, cap, wires, fuel filter and nothing has worked yet. When starting up, the engine idles / surges rough and usually dies the first couple of attempts. After running for 10 - 15 min. at high idle, it smoothes out and runs fine. If it's not warmed up, it feels like it's either flooding out or running to lean. Restarts fine after warmed up. The only thing left is the fuel pump I suppose, am I missing something? way2old Veteran / Moderator Jun 23, 2008, 5:04 PM Post #2 of 3 (4897 views) Re: 1991 GMC 5.7L V8 idle problems Sign In Since you think it is temperature related, try changing the coolant temperature sensor. Be sure to change the one that is tied to the computer. Being way2old is why I need help from younger minds kshields New User Jun 24, 2008, 4:12 AM Post #3 of 3 (4892 views) Re: 1991 GMC 5.7L V8 idle problems Sign In Thanks for the tip, I'll try that and see if that helps.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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