Problems when hot

Hi everyone,
I'm having a problem with my 92 camaro w/ a V6. When it gets hot it spits and sputters and backfires, and sometimes will stall. My engine light is on and I'm getting code 43. I've been told it could be:

Knock Sensor
Electronic Spark Control
or Throttle Position Sensor

Does anyone have any ideas? Like I said it only does it after the cars all warmed up!

Thanx!
Eric

I put my money on the ignition problem, usually they manifest themselves when hot before they stop working all together.