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If engine was running ok before tune-up, then most likely the firing order is wrong. Here is correct firing order diagram:
If ok, then let me know and we will go from there.
Im not sure the figure is clear to determine where the wire for Plug 4 goes into the distributor. Do you have a more realistic figure of the wiring?
Sorry, only diagram available.
Look on the distributor cap. The tower for the #1 plug wire should be marked with a 1. Now, in clockwise direction you will install the #1 wire there, then the #3 wire, then #4 wire, then the #2 wire.
Now the #1 cylinder is one closest to the passenger side fender. Install the #1 wire there, then #2 wire to cylinder next to it, then #3 wire, then #4 wire last.
That is correct