93 lumina APV code22

I have a 93 lumina APV 3.8 it would not start found bad float in the tank out of gas with a 1/2 tank showing added gas. It started and had a bad misfire under the hood and in the tailpipe. It was throwing codes 22,23,43 I replaced the knock sensor,and the spark plugs. It starts easy now but won't idle steady, I was still getting a code 22 all others gone so I replaced the tps, didn't change a thing. any ideas on whats next, one book says 22 is low voltage to the tps, another says the throttle circuit is grounded full open ? or is this just another GM thing like the s-10 I really could use your ideas and tips next fresh look at this.
Thanks Guys,
Mark

How about the wiring to the TPS? Check it for good continuity. You mighta sucked some debries up with the last of the gas, and that might've made it to an injector, killing it.