Garrettwess

It’s had a check engine light for awhile because the cats are cut and throwing code for 02 sensors it ran fine until like I said check engine light started flashing and getting bad idle I’ve not had these codes before besides the 02 sensor I’ll get the line replaced and for the knock sensor should I replace them see if that works

Hi I have 2003 Chevy Silverado 1500hd. Let me start from the beginning last August I replaced gaskets on the valley cover, intake manifold and valve covers. while I was down there I replaced spark plugs, wires, knock sensors and harness aswell but in the process of that I accidentally snapped a evap line that connects to the purge valve and goes down by the fire wall and have not replaced it yet and haven’t really had much problems until last night. it started idling pretty rough and the check engine light started flashing and has not gone away I plugged in a scanner and I’m getting codes for p0300 (random multiple misfires) and p0332 (knock sensor bank 2) so what could be throwing those codes would it be the evap line, injectors, coils, etc.