I have a 2001 Audi a4 Quattro, 186k miles on it. It recently has been skipping when giving gas to it. Had local part store run tests on it came up with air pump and o2 sensor. Anyone have any clue on what could be causing this?

 

skipping?

air pump?

vac leak
MAF
coil packs/spark plugs
try those three

 

Alright I'll try those when I get a chance. It's more of a hesitation when giving gas.