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Old 10-08-2003, 09:57 AM
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Idle speed.

I have a stock 95 C1500 5.7L Silverado.

I had my motor serviced at a garage for emissions. The motor ran fine until I was under the hood and found a golf tee stuck into the vacuum line connected to the vacuum advance on the manifold.

Finding the vacuum advance line was plugged I connected again?

Now the motor wants to die out in low cruising speed like if you were stuck on the expressway and were inching up and accelerate, it wants to die out. It will hesitate drop to almost a die out and regain idle speed again.

Now I hear from the exhaust a sound like I have a radical cam in it, it just does not want to give me a smooth steady idle.

Does the vacuum advance have anything to do with this?

Another mechanic said my distributor gear has worn. I might agree with that since I have 172,000 mile on it, but I'm just looking for other avenues.


Last edited by gm_junkie; 10-08-2003 at 10:42 AM.
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Old 10-08-2003, 10:14 AM
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I would guess maybe the vac. advance diaphram is ruptured and when you connected it back you created a vac. leak resulting in a higher map signal, causing it to run too rich?
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Old 10-08-2003, 10:20 AM
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The plug was probably accidentaly left in the vacuum line during some adjustments. Go back to the shop and explain it to them, they should re-adjust every thing. HTH

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Old 10-08-2003, 12:47 PM
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Check the distributor shaft

That many miles you can suspect the distributor shaft as well. There is a chance that the shaft is no longer holding a rotation adjustment even though the hold-down screw is tightened adequately. I have had this happen to me. I had the motor on my C20 hooked into a SUN Machine and set the degrees, only to see them slip all over the dial.

The entire shaft had to be pulled and replaced- the bushing had finally failed. The fix was about $52.00. It also felt a little lopey like there was a cam in it, as the timing slid around. Grab hold of the dist cap and see if it is there is the slightest bit of play in rotation.
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