That car has won an SCCA championship (2005 Street Mod 2 with the Ohio Valley Region SCCA), otherwise, not much to tell.
Code 33. Off the top of my head, have you checked/adjusted the TPS? Set it to .67 volts maximum (again, off the top of my head, but I'm pretty sure that's the maximum). See if that changes things. I'd have to pull out my old books (that are at my friends house) and see if there is any other info there.
Cutout? You're modding my remarkably stock car?....
It took me years of not doing any mods to that car to keep it as stock as it was when you bought it.
Actually, I'm glad to hear that you're enjoying it and going to start modding it in a proper fashion. I kept debating doing cams, etc and just never decided to actually get moving on it, so, the drivetrain is quite stock (besides the tuning and clutch/flywheel). Sounds like you're going to fix that properly.
You'll have to keep me/us posted on your progress.