My question is was it running like this before you pulled the engine to fix the oil leaks or did it stat running bad after the engine was reinstalled? Just trying not to overthink it.
The vacuum was always an issue as far as somewhat low, and erratic. When I first got the car the idle was set at like 1100rpm. I only drove the car 2 or 3 times last year.... so to be honest I really didn't take any notice of it then.
