Hey guys, my '73 2.0 runs perfect and has d-jet. Just driving up the street notice it sounded weird and wouldn't rev past 4,000 and sounded labored doing so. Still idles but feels like it is on two cylinders or something. Pulled plug wires off each cylinder while running and each cylinder did make a change so all four are firing. I do have a pertronix. I wonder is there a fuel pump relay or other relay that could be messing up? Thank you.
gg