Engine timing or drive shaft/u joints

[jenkx]

While hitting a cruising speed above 40 mph, I'm experiencing a vibration in my vet.
If I let up on the gas slightly the vibration goes away.
Any thoughts please.

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[Antz81]

When was the last wheel balance?

 

[Vettehead Mikey]

Sounds like u-joints to me. Check/change all six.

 

[jenkx]

New tires, balanced, and aligned.
U joints are certainly on the list.
I'm not sure how the vacum advance works on this engine. Any clues please.
Thank you for the advice.

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[bill81vette]

what year is your corvette???

 

[Antz81]

New tires, balanced, and aligned.
U joints are certainly on the list.
I'm not sure how the vacum advance works on this engine. Any clues please.
Thank you for the advice.

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I assume this is on your 82. In which case unless there has been some modifications to the distributor, you don't have vacuum advance. Timing advance is electronic from the ECM.

 

[jenkx]

This is a 1982. My concern is if the ECM is advancing properly. I'm old school from the days of points, condenser, and vacum advance. The ECM is new territory to me.

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[jenkx]

No mods except new Accel coil on the top of distributor that I know of.

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[Vettehead Mikey]

Too much/too little advance would not cause a vibration of the manner you've described.