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It came back today for a brief visit. The car wasn't warmed up and I was <25MPH. It went into "run like crap mode" and code 33 showed up right after that. I pulled over and shut down for about ten minutes. After starting, without clearing codes, it ran normal the rest of the way home without a SES light.
I think I need a custom prom and a little more IAC and TPS tuning.
I have been watching your posts as I have the same problem with my '87 roadster (Code 33 & 34). Mine are intermittent. I have done all the recommended checks (grounds, opens, etc.) and so far all checks out OK. But problem still plagues me. I do not have internal engine mods.
I thought it was completely fixed but I am going back tonight to have the front cats removed. I don't think it has anything to do with the problem but the Vette shop says its clogged and could be the problem. The code 33 has come back about 6 times in two weeks and it puts itself into the run-like-crap mode. I shut it down and start back up after a little rest and it works for another day or two. I'll try to post the results of tonights check up.