'87 2.0 Distributor issues, please help?

[Dr Steel]

It's getting spark now. Cat was also clogged. Egr needed cleaned. It runs well enough to get around the block now, but not well enough to actually drive. There's still a regular miss but it seems to only do it every other revolution or so. Timing light cuts out at a regular interval with the miss. It's weird.

New plugs, new wires, new rotor, new cap, new coil & resistor, rebuilt (new) distributor, cat unclogged, egr cleaned.

I'll try to take video of it "running" later today.

[SubGothius]

There's still a regular miss but it seems to only do it every other revolution or so. Timing light cuts out at a regular interval with the miss. It's weird.

Sounds like something specific to the ignition on a particular cylinder, prolly #1 since that's where the timing light pickup triggers off of. Would be interesting to move the timing light pickup to the other plug wires just to see if that regular-interval skip happens with any of those or not.

[xboxrox]

It's getting spark now. Cat was also clogged. Egr needed cleaned. It runs well enough to get around the block now, but not well enough to actually drive. There's still a regular miss but it seems to only do it every other revolution or so. Timing light cuts out at a regular interval with the miss. It's weird.

New plugs, new wires, new rotor, new cap, new coil & resistor, rebuilt (new) distributor, cat unclogged, egr cleaned.

I'll try to take video of it "running" later today.

Great progress & determination forgive my English in lecturing please...

My truck's misfire was the coil wire to dist cap connection (it was slightly loose) Expanded the connector end for a tight fit FIXED IT

I also used a good shot of electronic electrical contact cleaner spray on each spark plug wire end to not only clean but to REMOVE any silicone (silicone of ANY type will/can cause misfires..!!!!!!) Do the same on main wiring harness connection to the carburetor and engine sensor connections yada yada) Dry connections before reconnecting blah blah...

I also Always use a spark plug removal tool to remove & install spark plug wires onto the spark plugs...

Even though your wires are new, I would DMM test them anyway... New is not always Good..?

Make dam sure the rotor & distributor cap are NEW or like NEW (all metal is shiny clean)

Last suspect could be the IC chip inside the distributor but I would leave it alone for now...

PLEASE WATCH Testing Ignition Coil with DMM: https://youtube.com/shorts/tGeZQUHzGrg?feature=shared

PLEASE WATCH Testing Spark Plug Wires with DMM: https://youtu.be/4_EFGAFxi1w?feature=shared