i have a problem with my car... i think it may be the ECU, but i'm not sure.
there is the symptoms: when car is between 1500 and 2800 rpm, it give some knock (just like it was on the verge of chocking).
when the car is over 2800 rpm (let's say 3000...), everything runs great (no power lost). The car dont have any check engine light on (so no code).
This problem has happen since we boost the car, and we accidently short-circuit when we done it (not the proper order, some sparks have appears and i blow a fuse).
any idea of what going on??