vacuum leak
1992 lt1 corvette runs good until it reaches 190 degrees the starts rough idel and backfires/ the car would kinda run rich in its past with black smoke at times
Sounds like a bad vacuum leak, maybe a bad intake manifold gasket?
check make sure the firing order is correct.
You could have the firing order messed up.
plugged catalytic converter
Carb.? Float sticking? Rebuild or replace
A roughneck or a ruffian
It stalls even when warm
Check your vacuum hose.
Did you manually clear the codes ?
is it running out of fuel?
you have 2 live Boston and audition when a new season starts