1966 Skylark GS Runs Terrible

namdlo

Newbie
My car has a 67 340 engine and turbo 400 trans that was swapped in years ago. Driving down the road running great and started running terrible. like it was running on 5 cylinders. Points Ignition so filed points to clean and regaped. This had worked before. No difference. Put in new coil , points, and condenser. No difference. Im stuck. It has the original engine compartment wire harness that i unwraped to check wires and all wires seem to be good. The resistance wire is in place and dosent seem burnt. Any help would be appriciated. I have a multimeter but truthfully dont know how to use. She ran fantastic before that day and just ,bam, started running terrible
 
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