JPS2

2 weekends ago I put racegas(100oct) in my car and as expected I enjoyed the hell out of it. After the weekend I put normal gas in and after a few normal days, my boost went down to around 12psi. The car started hesitating a lot. I checked the BPVs(baileys) and looked at the hoses (didn't take them off yet) but didn't see anything obvious. A few days later boost went down to 5Psi after running for about a minute on 12psi. This happens now everytime. You start the engine, start driving, boost is around 12 for about a minute, the car starts hesitating and then drops to 5psi for the rest of the trip. I brought it into the dealership and they blamed my aftermarket airintake (hard to believe). I used the VAG tool to recalibrate the throttle with no success. There are no errors present either.
Any suggestions other then taking all the hoses off and check them.

System_S4k

Check your MAF with the VAG, an 02 sensor could also make the car FUBAR.

Taner Halicioglu

Limp mode. Check for DTC's... might be your MAF.