Rough idle on 2000 TS 2.0
I've a 2000 Spider. Normally, it's quite smooth. But sometimes whenever I push in the clutch or shift to neutral, the revs drop to almost zero. It sputters a few times with the rpms wavering between 0 and 1k and then smooths out. It's only actually stalled out on me once while doing this, but it sounds like it's getting ready to stall.
I changed the engine air filter, but that doesn't seem to have solved the problem. After driving for a while it seems to go away, but then will come back again later.
I took it in to get serviced and mentioned the problem, but it behaved itself when they were driving it so I guess they didn't believe me and didn't do anything to fix it.
Any suggestions are welcome!