you have the right idea with the ignition coil...thats what i would suspect because i left my hood open in the middle of a snow storm and it barely idled the next day...just cleaned up the contacts and dryed the coil and its worked fine since
96 Jetta GLS-Sold (unfortunately)
Now have a 2009 Dodge ram 2500 (but thats not stopping me from being here...seeing as how i did own a VW for a while!)
-Only because i live in alberta and we are truck guys out here!
Stereo Setup Sold with Jetta- However install in truck is starting to get into motion.
-ALL JL AUDIO, 2-12W3 subs, 1500W TMA Monoblock, 400W TMA fourchannel, 2 Sets of components, with Double din touchscreen and GPS ALL CUSTOM