2.5 tdi quattro - chip causing problems?

[Red_Power]

I have a 2001 a4 180 quattro with 135k on the clock. I bought a chip from tdi-tuning to take it to around 220hp and fitted itself. There is a very notticable increase in performance but under medium/heavy load at 1800-2000RPM there is a vibration coming from somewhere. The car still pulls well and the vibration disapears at higher rpm. Without the chip there is no vibration but there is a serious dead spot at the same rpm, pulls well up to 1800 then nothing for a second or 2, then its away again.

I have also experienced the sudden loss of power others talk of on here, engine completely cuts out for 1-2 secconds then fires up again. This has only happened twice, both times it happened under full load after a prolonged period of thrashing the sh#t out of it. Not sure if the two problems are related or if it is the chip causing them or if they were already there. Anyone else have a tdi-tuning chip? Any advice is welcome

 

[diffas]

Vibration probably comes from dmf and can be fixed by reducing torque on low revs.

You need to read fault codes to find out why it cuts out. I bet the problem is with fuel delivery...for example old and wasted fuel filter or jammed fuel line.