Question about 1998 Chevrolet K1500
I have a similar problem. The engine run fine at idle but hesitate if increase the rpm with no load. If I pump it hard it is ok. I am not able to find the problem yet.
Posted on Oct 05, 2008
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Posted on Jan 02, 2017
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Jan 10, 2017 | Cars & Trucks
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Engine stall or RPM fluctuates
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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