hi guys just wondering if anyone can help me which my problem.
After about 25mins of driving or when the car really warms up. The car suddenly starts making this weird noise from the back off the car sounds almost like a cat crying like mooa mooa mooa and the ilde starts jumping around and almost stalling and have to really rev the car hard to get it off the line. Then if i leave it overnight its fine when i start it up again when its cold but then will start doing it again after a while of driving?
Its a s5 turbo 2 with blow off valve, air filter, bigger fuel pump which i recently put in, chipping standard computer.
any help would be greatly appreciated.

 

check all of your connections on your fuel pump... thats the only thing i can think of