Hello guys, I have the following problem: I had my engine overhauled after a capital engine damage (from the tensioning roller on the timing belt is a bit broken and has everything adjusted -> Valves broken) . The cylinder head has been completely reworked and welded, new valves and valve shaft seals inside, piston reworked, tooth and V-belt replaced, phasers replaced, new pleu bearings, piston rings and water pump are installed. . 4000€. Now to the actual problem: Since the engine has been overhauled, it runs smoothly, but 3rd – 5th gear it falls between 3000 and 4000 revolutions into a total power hole where it almost no longer comes out. In my opinion, the suction noise and the stuttering sound as if it were only running on 3 pots in this area. However, I’m not sure. Strangely, this was not there before the engine damage! The workshop said that maybe it was a After I had installed the original air filter box, the problem persisted. After the first error reading, the PC indicated that the lambda probe heater was defective behind the KAT. After the change there was no improvement. The master of this workshop and I are baffled! I think that this problem was not there before, since I had only about 90hp xD before (the engine was quite at the end). After re-reading at the ATU I now have the error code: P0304 Combustion cylinder 4 ; Burn-outs detected. What else could that be? I really have no idea anymore -.- Can someone help me maybe? Thanks in advance! Mfg: Nico