So I have a 2003 chev avalanche it's misfireing and gets gets worse when it warms up

Question

I've doing compression test fuel pressure replaced plugs wires coils checked for air leaks can not figure it out

Answer 1

When it comes to these engine a plugged exhaust system would set a random misfire, Even a 02 sensor code just for one side would set a misfire condition , Also checked the fuel pressure regulator for any fuel seepage into the intake

​Checking the fuel pressure regulator for fuel seepage into the intake manifold just remove the vacuum hose if fuel seeps out replace fuel pressure regulator