Hello, i have an issue with my silverado that has me worried, i've been getting the P0300 code but cannot diagnose the cause the only other codes i get are for no cats and the EGR delete
So far i've checked
plugs
wires
Fuel pressure
All filters
Coils
i got the engine regasketed and it doesnt seem to be loosing compression there is no ticking or rough idle it seems to only happen during acceleration in drive not when revving
I've been told it could be clogged exhaust or cats but Its got long tube headers no cats and a V6 muffler (it was a 4.3 before) the swap was done long ago and this issue is recent so it was not a swao related issue, no specific codes so any advice as to where to start would be greatly appreciated.