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Only just noticed this (I often forget to check the Mk2 forum). Sounds very much like the throttle position sensor (TPS). Fairly common failure with ABFs and will throw a fault code in most cases (P0121 IIRC) - do you have the OBD plug wired up? Hope so.
Another part that will cause this problem is ECU relay #30, which can also create intermittent misfiring around 2500-3500 rpm, as well as stalling when coasting to a stop. It's actually worth replacing this regardless, as it's only $33 from VW and will probably fail soon anyway!
Doesn't sound much like a dodgy ISV - they'll tend to create stalling at cold starts or very high base idle when hot if not working correctly. Worth cleaning for good practice, though
Your engine is an OBD2 version FYI.
Another part that will cause this problem is ECU relay #30, which can also create intermittent misfiring around 2500-3500 rpm, as well as stalling when coasting to a stop. It's actually worth replacing this regardless, as it's only $33 from VW and will probably fail soon anyway!
Doesn't sound much like a dodgy ISV - they'll tend to create stalling at cold starts or very high base idle when hot if not working correctly. Worth cleaning for good practice, though
Your engine is an OBD2 version FYI.
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