my 03 dodge caravan runs good on flat ground but when you have a hard pull or going up hill it looses power is seems to get a little better if i ease off the accelarator a little but this dosent fix it. i have replaced the plugs,wires.fuel filter ,air filter. and coil pack. i also cleaned the mass air sensor. i dont know what eles it could be but a fuel pump or regulator? can you help me please?

steve, April 2013