I'm looking at an A4 for sale, and the seller describes it as a very rough idle and car will shut off while driving sometimes. He has replaced the throttle position sensor, even replaced the motor. Sounds to me like the CCM, but can anyone confirm this for me? I drive a passat 2.8 V6 and am not too familiar with all these problems brought on by the 1.8.

Thanks.

 

Get the codes read. It could be a bad MAF.

 

He said he cleaned it and it ran good for 3 days, does this mean the MAF is not functioning properly? Seems to me it could be so.

FWIW, the car is modified and this is the list provided:
motor swap with about 68k on it
PES Gt28 turbo kit with rebuilt turbo about 9k on it
440 injectors
front mount intercooler
greddy profec b electronic boost controller
heatsheild
Full milltek exhaust
APR/Stoptech BBK
H&R Coils
Front sway bar
Drive train stablizer
Vis carbon fiber hood (clear coat is peeling so needs a fresh coat)
S4 grille
Ecode 1 piece headlights
reiger rs4 front bumper and sides
debadged
rear m3 style lip
VMR V708 wheels in gunmetal wrapped in pirelli p zero nero high performance all seasons with good life left on them
two a pillar pods with boost and air fuel ratio guages