I have been reading these old threads about misfires, in my case #5, and find them still relevant in 2019. I didn't follow perfect deductive reasoning.
1. checked spark going to plug.
2. replaced fuel injector $45 fcp_euro
Then I followed the electrical system backwards ,
3. swap ignition modules and plugs with the #1 cyl.
4. spliced in new set of wires from Dave Barton leading to the ignition coils.$173 delivered. Worth every penny, his wires are color matched to the old wires. Then added a heat protected velcro sleeve from Cool It Thermo Inc. from Amazon. $11. At least erratic signals are removed for fututre worries.
5. And then the front power module $20 from German company Heuer. I don't have the technical wherewithal to discern quality between Heuer and Bosch at $230. Only out $20 bucks if wrong.
6. The power module replacement solved the problem. Back to sewing machine smoothness.
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