[pszemia]

i have been in your situation, 2 years ago. I ended buying the gas exhaust analyzer, MFI tools, and lot's of new gaskets, reason? The previous owner was a porsche owner, vw mantain.

The first thing you have to do is CMA, there are a lot of help on this forum.

But first, buy the things you need for CMA, and do it yourself, it's easy, have to learn some things, but you will save the mechanic costs, and learn a lot of things.

Also, don't try to low the idle avoiding the CMA process, with the throttles screw.

as i learned here, the MFI doesn't have sensors, so you have to put everything in it's place, and when you finish, it will run like never did.