The car is a manual 4 speed. It's not an automatic. I don't believe there are any vacuum lines going to the transmission so I'm not sure what the modulator is doing.

The motor mounts are cheap so I will change them first. I can also do a compression test. Any idea what the allowable variance between cylinders should be?

I recently adjusted the valves but that didn't help much. I also did a diesel purge.
I guess I'll buy new injectors since I'm not sure when the previous owner replaced them.

I'm a little reluctant to raise the idle to fix the problem. The can doesn't have a tachometer. Is there an easy to to calculate the rpm's?

Thanks.

pete