Rather than opening the hood and throwing random new parts at an undiagnosed problem, you should do some research on the Interwebs and some testing/inspecting on your Cherokee.
Are ALL the tune-up parts fresh, including the coil ? Have you tested the fuel pressure ? Have you tested the fuel injectors ? Have you tested the O2 sensors and the Coolant Temperature Sensor ? If you think the head or head gasket is the cause, have you tested for failure ?
A new Gallup opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.
Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...
Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.