i have a 1995 z-28 with the lt-1 engine. The engine starts and runs fine until it gets up to operating temp. and then it will spark knock and backfire at low rpm up until about 2500 rpm then clers up.Fuel pressure is 43 psi at idle and there are no codes present thanks in advance for any tips.

 

Have you checked your wires/plugs?

 

plugs and wires are new

 

same things happenin to me..... i have new plugs and wires too idk wtf is wrong