Question about 2000 Chevrolet Silverado 1500

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1988 GMC 6ci truck vibrates at idle or when i stop at stop signs

The hole truck vibrates real bad when am idling or stop waiting for triffic to go. when i first start the truck it doen't do it but when it warms up it does i just changed spark plugs/ wires/ distributor/ air filter / oil change/ fuel filter/ it getting so bad

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  • Chevrolet Master
  • 6,674 Answers

Find your EGR valve & try disconnecting the vacuum & or wires to it temporarily and see if it changes anything. Be sure if it has a vacuum line, you plug the line with something when you remove it.

Posted on Nov 23, 2008

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Define the issue a bit Further. does check engine light flash while stopped? check the basics is there air restriction and when where plugs last changed?

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Started in cold weather yesterday. Ran real rough, almost like a motor mount bad. Fan turns by itself when turned with your hand.


If it only happens in cold weather, check your intake manifold bolts for tightness. #5 & #6 by the firewall are easiest to check. Some people will find these not even hand tight = rough running car.

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The car vibrates when it idles. It vibrates so


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My 1998 chevy truck 1500 vibrates so bad when i stop or when idle


You left out a lot of needed information but I will try to help out.
You can pull the spark plug wires off one by one while the engine is running to see if you have one or more cylinders are not firing. Depending on how long it has been I would do a tune-up first, replace spark plugs and wires, filters, fluids etc.
With that done and if all cylinders are firing pull the transmission dip stick and look at the fluid, I am assuming you have an automatic tranny. The fluid should be a light red, if it is brownish and has a burnt smell then you could have a problem with the clutches inside your transmission which can cause this same problem.
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