First, check your ignition system (plugs, caps & rotors, wires/tips)...you could just need something "cheap".

Then, if that yields no results, do a search for "wiring harness". Once you get the results, sift through them. I'm going to guess that within a few days, you might be under the hood, looking at some wiring harnesses really close.

Oh, and there is another device, that is expensive and hard to get to...some sort of throttle position sensor. I hear that they can mess things up as well.

-hope this helps

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D