So nice morning to take the TR4 out, but she was being difficult. For some reason under load (2800+ RPM) and hard acceleration, she starts to putter and cough. I used to have a turbo and when the wires or coil went bad, this was the case, but this isn't a turbo. Suggestions? Where do I start w/o buying a Petronix kit, coil, plugs and wires? Or do I? I know my old '48 Willys Jeep used to give me crap all the time, but then I put the Petronix in and eventually a new fuel pump and that solved the problem.