Question about 1999 GMC Sierra

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Truck idles fine but has no power

My truck starts up and runs fine untill it warms up and then when you step on the gas there is no power but will idle fine.If you shut it off for a few minutes and restart it will run fine for a while and then loses power again.

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  • carhob May 11, 2010

    is your check engine light on,if yes ,scan it it will point at problem area.

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Does the exhaust sound muffled? Could be a bad catalytic converter.

Posted on Mar 06, 2009

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Lets start at the beginning. Is the check engine light on ?
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Chugs, acts like it's not getting gas once warmed up. Idle's fine


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4 cyl Engine starts and idles ok...give it throttle and it dies


I need to get a clear mental picture of what exactly is happening.

With this said, you stated that the car "runs fine" until warmed up.

Q: When you start the car when cold it idles fine?
Q: If you allow the car to idle until "fully" warmed does the car stall?
Q: As the car begins to warm up, Does the RPM fluctuate abnormally?
Q: Does the car Only stall when you press on the gas pedal or does it stall just sitting and idling in addition to pressing the gas pedal?
Q: If you can drive it while cold does the car stall during acceleration when warm or only at Stop Signs / Lights?
Q: If you wait 20min or so, can you start the car again?
Q: How many miles are on the car?

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Rough idel when cold start


if u have a damaged plug it can be running on 1 less cylinder ,it will idle very rough,change it!

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check the choke setting

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2006 Chevy Colorado, rough idle when cold


Mine did the same thing at 16K miles, I cleaned the throttle body and the ploblem went away. Took me about 30 minutes.

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