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Discussion Starter · #1 ·
I just noticed that the engine is shaking. I have already installed new engine mounts. No codes from the reader. When the car warms up and the idle drops it starts to shake. How can I check for a vacuum leak? Does anyone have any idea where to find a vacuum line schematic?
 

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How many miles are on your car? Has the PCV valve ever been replaced?
 

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Recently had a similar issue on my mk1, in my case was a combination of incorrect timing (after cambelt change) and a failing serp belt tensioner (which failed shortly after). I resolved those and also replaced cam cover which was cracked and had a leaky gasket and the problem was completely resolved, ran smoother than I'd ever known it afterwards.

May not be the same in your case but some things you could look at. Took me several weeks to diagnose the serp tensioner until it failed and obliterated itself lol :)
 
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