Chevy & GMC Vans

Hello guys tried to do the due diligence in searching the forum for previous posts, great tips about motor mounts, may need to explain this a bit further.

Changed plugs to NGK Iridium, plug wires, distributor, and rotor, the change tips posted were fantastic, noticeable difference in acceleration.

One problem, while in Drive, after engine is warmed up, the idle feels low only when stopped in Drive, strange vibration, does not stall, but feels darn close to stalling, go into neutral, rpms up a little bit to comfortable feel. If on incline in Drive vibration worse, turn on the A/C (Miami, FL) vibration worse and lower rpm's slightly looping.

Took NGK's word for granted that the plugs are pre gauged and did not check them before install, was that a bone head move?

The gap on the drivers side between floor and engine is so darn tight the plug wires may touch just slightly at that plastic slotted bracket could this cause it?

Could the infamous engine mount cause this low rpm while stopped in Drive? Tips to check the mounts?

Thanks!!

I had something similar. It sort of felt like the rpm was down, although having no tach I could not actually say what was going on with the rpm, but it was not so much of a change that I focused on that. It was more the vibrations and that was the transmission mount.

I've had to change the transmission cross member mount on a couple of my vans. I would also check the gaps.

Have you cleaned the throttle body or ever used fuel injector cleaner? How's the cap and rotor look?

Thank you for the tips, will try each of these....process of elimination, something keeps me thinking about the distributor cap.....

Wow what a difference new transmission mount makes, van was smiling in happiness.

Is there a recommended location to lift the engine when changing the motor mounts? Couldn't find mentioning of it in previous posts.

Youtube video shows a 2 x 4 on a jack lifting from this nub in the picture on the drivers side on the manifold, is that ok?

And it looks like this is only on driver side? couldn't see the same thing on the passenger side of the engine. thanks for all the tips, fantastic stuff.

There are support flats on each side of the block. If your van is AWD, this may help: viewtopic.php?f=39&t=9815