I put the 87 rx7 NA i got back together. It was a fuel pulsation damper that was bad, got a new one. Put it all back together with new seals, gaskets and vacuum lines. Sealed it up really nice. Fired right up and ran perfect for 45 minutes then died for no apparent reason. No start after that. After some screwing around I figured out it was flooded. Cleaned on the cylinders and plugs. Fired up again, ran really rough, could not hold idle. Figured it was just too much fuel in it. Ran it at 2K for a few minutes. Still would not hold idle and had a random miss at low rpm. Ran it about 10 minutes. Noticed it was smoking from the engine, shut her down to see why. Exhaust manifold to the cats were glowing red. Removed cats, 1 pre cat fell apart and was lodged in the other, main cat was half melted. Planned on cat delete anyways. Tried start again, still rough, still miss, still no idle, backfires if you rev it up and let off. Confused as all hell.

Pulled the intake again, checked everything 3 or 4 times. Pulled egr, it was clogged solid with carbon, so not a stuck open egr. Compression test showed excellent so apex and rotor seals seem good. Plugs looked new, fuel pressure good.

I noticed the 2 sensors on the air control valve for the emissions were broken, but no big deal being emissions. plan on emissions delete soon anyways.

So I have no idea whats causing it to run so shitty. Going to try to clean the injectors, if thats possible and try fresh fuel.

What plugs are recommended for a 87 NA too, I got 7's and 9's in it now.

any other ideas?