My problem is when my tank of fuel is full - my throttle feels really sluggish and slow. But when the tank is almost empty throttle feels VERY sensitive (like it should be from the factory, I guess). And it is not because of the additional fuel weight, if a big friend of mine sits in my car when the tank is almost empty - throttle is still very sensitive
My only guess is fuel pump, as I cleaned it several times (here we have very dirty gasoline sometimes), but I can't imagine why
Maybe it is somehow connected with the self-learning ecu?