please help.
2001 audi a6 2.7 turbo.
My car has feels like its choking a if i accelerate after 2000 rpm . then sometimes it normal aging . i scanned the car and it said cyl. 4 misfire i changer the coil . same problem i scanned again and i got p0300b code i erased the code drove the car runs same sputters scan again new code P1131 . does anybody know what can it be.once i a while the car will run normally again for 1 or maybe 2 pull from stop light. After that it will sputter help . I f i rev the car while its standing the engine runs good no sputter smooth as a butter , feels like it happens under load

 

check the throttle body "Y" boot were the charge pipes enter the throttle housing, my car acted up like this last year and there is a tsb online for a similiar issue, alls you gotta do is take off the front engine cover and you should be able to stick your hand up underneath the boot, if in fact there is a tear than you will know immediately. this car does not like to suck un-metered air