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    pellster's Avatar
    pellster Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jan 4, 2010, 10:30 PM
    1990 silverado
    I have a 1990 Chevy 1500 silverado 5.7 liter. When starting the idle surges for a bit. After a while will idle a little better. When driving has lack of power especially when going from stop. And does not sound right. When turned off the idle thing starts all over again. Help!
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Jan 5, 2010, 06:25 AM

    . Clean the Idle Air Control Valve, throttle plate, and throttle body with a spray can of brake cleaner--be sure to wear safety goggles. Afterwards, replace the air filter.

    . Install a new Ignition Control Module (ICM).
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #3

    Jan 5, 2010, 06:27 AM

    A sticking or sluggish Idle Air Control (IAC) valve could cause at least some of what you're experiencing.
    Use a good carb/throttle plate cleaner. Follow the instructions.
    When you say "lacks power", is that like a hesitation? You may have a worn spot on the Throttle Position Sensor (TPS). If that's the case with your truck, replacement is the only option.
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