One of my coils went funky about 2 weeks ago (car barely ran and fuel in the exhaust smelled like rotten eggs) so i replaced 1 coil and all the sparkplugs.. car seems to run okay but when i'm coming to a complete stop my rpms drop to about 600 and then back up +200ish.. kind of stutters i guess. I pulled a code under ABS something about voltage supply ( i'll go get the exact code later). And when i press up on my windows all the lights on the dash dim and my rmps drop by about 100.. (maybe normal but idk). anyone have ideas on this? my first thought was battery but thought id check with you guys. Havn't had any problems starting or anything...

 

my guess is the battery, change that and buy a brand new one, i doubt you will get the same problems your having now afterwards.

 

I think I will replace the battery.. its about 5 years old so its about time if its going bad or not.. Heres the abs code I pulled..

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Address 03: ABS Brakes
Controller: 8N0 907 379 J
Component: ESP FRONT MK60 0101
Coding: 0019473
Shop #: WSC 01236
1 Fault Found:
00495 - ESP-Sensor Unit (G419): Supply Voltage
012 - Electrical Fault in Circuit - Intermittent

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well is your check engine light on also? If so, i had the same problem minus the dim lights when controling everything else in the car. It was my MAF when i changed that, my esp light went off as well as my check engine light.

 

I don't have any lights on, just the code I pulled with vag-com