Question about 1999 Chevrolet Silverado 2500

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1999 Chevy silverado

When I start the truck when it is cold the rpms will fluxuate about 500 and sometimes will kill. I repalced the o-2 sencors on the exhaust.

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  • Anonymous Jan 04, 2009

    Exact same problem on a 2000 Chevy 2500.  cold starting idle fluctuates and will sometimes stall.  Once the engine warms up....problem goes away.


    I also have a coolant leak that just began.  A friend tells me it is probably the water pump.

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Hi a bad water pump will not let the engine run normal unless it is frozen up. it sounds like your coolant temp sensor has gon bad.that will cause rough cold starts and work fine after warmed up

Posted on Feb 02, 2009

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