I have a 93 Camaro that is barely able to run. It has a new tune-up (wires, plugs, air filter, PCV, fuel filter) with every sensor being replaced (i.e. oxygen, air, coolant ecm, etc.) New fuel pump. Still have very rough idle and major hesitation / bucking. Took it to the dealer, and they said it was the fuel sender assembly. The fuel guage does jump all over the place, but my question is would a faulty fuel sender assembly also cause all the other problems. I know it is a fuel delivery problem because it fails the fuel pressure test when the key is in the "on" position and when it is started. Just not getting enough fuel. I thought it might be the fuel pressure regulator but the dealer said it was the fuel sender assembly. Any ideas or suggestions? Just want to make sure that a faulty fuel sender assembly would cause all these driveability problems before I take the tank down again to replace that instead. As I mentioned before, I just put a new fuel pump in because I thought that was it at first. I could care less about the fuel guage jumping all around, if that is all a new fuel sender assembly is going to fix.