So I went to the store and it ran great. Started it up to leave and halfway through the parking lot it started to buck and the rest of the way home it ran off one rotor. Got home and confirmed rear rotor isn't firing. When I crank the engine it doesn't sound any different like I've lost compression. If I. Ake it try and run off just the rear rotor it tries to run but won't start like the front rotor will.
my catalytic converter is noticeably more clogged as in o can open the 5th/6th ports fully just reving the engine buy 4k and could not before.

 

If you have access to a compression tester, it's a good idea to test it. If you don't, just take our one spark plug & the EGI fuse under the hood. Then crank it and listen for 3 even puffs from the rear rotor.

While you're in there, this is another easy diagnostic you can do. Swap plugs & wires from front rotor to back rotor and vice versa, see if the problem moves. Then you know if that's the issue.

If you have good compression and the ignition components are good, then it is likely a fuel injector. They don't normally just go 100% dead immediately like that, but anything can happen.

 

Ok well I pulled spark plugs and it has not lost compression it sounds exactly the same as the front rotor. Fuel is rusty in tank so next I guess I'm pulling the tank and cleaning and coating the inside. Also re-clean the injectors since I just rebuilt them. Also gonna replace fuel strainer and filter.