Need some help plz

[crslaw21]

My 04 A4 1.8T has been acting up lately. It started with a P0171 lean bank 1 code and then would through in some P0300-P0304 codes. I have found and fixed 3 different vac leaks and just replaced my battery today. The car after replacing the battery is much improved but the lean code came back on and the car still misses and hesitates at lower revs. At idle in drive its around 1k-1.2k and in N or P it jumps to around 1.4k-1.5k and you can still feel it missing but not as bad. I couldnt find another leak and I dont have a vag-com. Any ideas before I take it to VW? (Audi is a 2hr trip on way )

[Audi Skate Snow]

sounds like a vacum leak but also maybe check your MAF.

[Gallep]

check your MAF.

…by unplugging it while the engine is running. If nothing happens or changes with the engine while the MAF is unplugged, chances are it's your MAF.

[crslaw21]

Any tips on getting it unplugged? The damn thing wont come off.

[Gallep]

Try pushing the plug back in. This sometimes "resets" the securing tap in the plug. Then try it a few more times. If you're careful, use a small flat head screw driver to insert into the small rectangle and pry the tab up and it should release.

[aaaudiprotein]

Do u still have your stock airbox?

[coowhip]

I would say MAF as well, happend to me. But my car would actually die. Could be an O2 sensor as well.

[crslaw21]

You mean the tab I broke? lol Yes car is 100% stock

[crslaw21]

Well sometimes it runs better then others. Right after I replaced the battery the car died the first two times I started it up, and on the 3rd time I gave it some gas. Then it settled down and started running ok with a slight miss

[Gallep]

You mean the tab I broke? lol Yes car is 100% stock

LOL, Sorry to hear that. When you break enough of them you'll get the hang of it. I've had my share of broken tabs when I was a tech, I'm just glad they weren’t on my cars