help me out guys. 1991 Firebird TA, tbi 350. engine is new 20 000 km ago. what happens is at cold running, no noises, runs great, however, as it reaches running tempurature, it begins to develop a rather nasty, continuous spark knock. I have not dealt to much with tbi, as well as more modern ignition systems. until now i was always carburetors and old stuff. help me out on how i should proceed. My knowledge is saing the timing is out, but i may be wrong so i need your guys knowledge on this one.

no check engine lights, yet
no codes flashing(except the one for air bag-6 times in a row at start up)-you could answer this one as well if you like.

appreciate any help

thanks