how old is ur car, have u cleaned ur injectors lately, do u do regular maintance, ie plugs, plugwires, do u have a decent air filter? my car used to bog when i started acceleration from a stop, especially if i floored it found out that it was mostly just crappy nasty injectors, sticky valves, and worn out oil. with regular maintance u should fix them problems if not ur engine might be having some issues, is it predetonating? bogging all the time or only during heavy acceleration, are ur tires the same size that they are supposed to be? or are they larger