Need help to understand this problem with my Audi A6 (1998 AHA engine) was running rough and the check engine ON. The OBD code was P0302 which is misfire #2. The car was running fine no problem, then I took it out to carwash the engine (underhood). I drive it home not problem but the next day I drove it the check engine flashing then stay ON. Please let me know if you can point me the problem so that I can DIY repair. Thanks.

 

sounds like something in the engine bay got wet that shouldn't have gotten wet.

did you cover the alternator and the MAF? Did you use high pressure spray??