hey guys i got a 2000 Audi a4 quattro with the 1.8l turbo engine its got 87k miles on it and its 5 speed. the timing belt just went on it and i had to replace the head, rings, valves and lifters. and when i got the car back it ran perfect for about 3 weeks then today i was coming home and the check engine light started blinking and it lost power as tho it was running on one or 2 cylinders what could be the issue so i can slap the garage who fixed it in the face

 

Missfire, check the coil packs & spark plugs.

 

prlly coil packs no biggie just get your codes scanned