My Jeep(4.0 L)runs very rough from ±1200 to ±2500 rpm. Idles smooth most of the time. As the throttle is applied, the engine shakes & is reluctant to rev up. I have to feather the throttle to slowly increase rpm. There is almost no power to move the vehicle. Almost all sensors are new, fuel pump & injectors replaced. All ignition(cap, rotor, wires, plugs, coil)parts are new. Converter removed. ECU replaced. Throttle body cleaned & rebuilt. Can't detect any vacuum leaks. Head recently rebuilt. Intake manifold gasket replaced. Compression 120-125 psi on all six. Thank You.
Tuesday, March 5th, 2013 AT 4:04 PM