dipstick isnt anything to do with it idling too high. maybe the timing is moved slightly.
ive got a similar problem with my gti, just wont start and keeps on flattening the battery in about 40 seconds of turning over. i lost my rag and took it out on my nova in the garage. it needs a new door now, lol.
ive had the dizzy cap and rotar arm off on mine and cleaned the connections but it started again after that, just wont do it now.