Vibration

[z28clone]

I did some research and didn't find much advice. My 2000 Montana has a vibration while in park. Goes away when driving. It is slightly worse when the AC is on. Top motor mounts look good. Is there another motor mount and where is located? Pulleys don't appear to be wobbling when engine is running. Any thoughts? Thanks

[z28clone]

After I thought about it it doesn't go away, it is alot less noticeable while driving. About 3-4 weeks ago on a long trip the van acted terribly where it jerked horribly front to back, then stopped jerking and hasn't done it since. And the vibration might have started after that.

-Also I researched about a fuel gauge and the drivers power window issue. I will provide my results:
-Drivers Power window switch didnt work for either window. Opened up the swtich and the contacts were fried. Bought a junk yard one, still didnt work, cleaned the contacts, still didnt work. Looked under passenger carpet for corroded wiring. Found the spliced connection of the yellow wire fried. Fixed the splice now it works.
-Fuel gauge. When you put the key in the on position the gauge would go up and down like it had a mind of its own. Took off the larger harness under the floorboard under the 2 row drivers side seat. The contacts were green. Cleaned the contacts and fuel gauge is working now.

[z28clone]

Noticed the bottom engine mount is pretty well gone. It is located on the passenger side under the pulleys. That is most likely the problem.