Firing the parts cannon to hunt what's wrong with my Suzuki Cara Autozam AZ-1. (Fuel system episode) 

I'm getting second hand frustration from this😂

You kid is a smart one. I remember him saying multiple times "Daddy's car is bwoken" while I was there 😆 I hope you at least wiped down the bottom of the tank before putting a new filter...

Check your ignition timing with a timing light, or under the distributor cap is the CMP Sensor (signal generator), check the air-gap and pickup coil resistance, it could have drifted over the years.

I ran into a very similar problem on my autozam a couple months ago, it ended up being wiring gremlins. The pins on fuel pump connector were damaged so the pump was not getting enough power and not spinning fast enough. Replaced the connector and magically everything was fixed!

I’m in the same boat with my AZ-1 similar gremlin, but mine is struggling to even rev after warming up. Replaced map sensor, plugs ,fuel filter, checked fuel flow. I feel your pain

❤

W five speed cap, I’m getting ~35mpg without trying. It’s more when I avoid the highway.

That are not Philip’s head screws that are JIS which is a completely different driver.

That's an ASE certified milk jug.

Look into the exhaust system. I know that when a cat starts to go, it can cause similar issues

Shouldn't the AZ-1 have an OBD-1 system? Have you tried checking the codes? I know most old JDM cars have a port you can jumper with a paper clip and it should give you a morse type code with the CEL light.

Shot in the dark - Any chance that something's amiss with the speed limiter circuit? For example if the signal from the reed switch is active (like it would be at the max limited speed) due to a short or bad ground, the ECU may be trying to do the speed limiting when the engine hits the minimum limiter RPM (I forget this exact value... it's in the service manual somewhere). That's a remarkably consistent "it stops at this RPM" for a mechanical fuel/air problem.

Don't reuse the sock on the fuel pump... It's probably crusty and all that. I know mine was. Never mind the size of it, just use the new one. But what a bummer about your problem :-(

Replace the whole distributor....your welcome