2004 Chrysler Sebring the RPM is not enough

I already change the engine with new water pump, and new oil pump. The engine was around 100000 miles.I changed the crankshaft sensor and the camshaft senser. I already checked the primary timing chain a lot of times!I alredy check with the scaner. When I try to give it more then 2500 rpm the engine does not respond. Like if it didnt enough fuel. I alredy checked the fuel pump. And I do not now what else to do