sorry if i missed something stupid simple. very new to tuning. but started with my bone stock air filter to tailpipe 2002 sierra 2500hd 6.0 4l80e. i do have an exhaust manifold leak(assuming the cause of the slight high fuel trim).
purchased wide band but have not hooked up yet.
at about 48s into scan i have knock at about 4k and .78cyl g. reading 22*, but in my high octane timing table it shouldnt be that high there...... and yes my table needs a lot of smoothing.
help appreciated
been reading and watching videos for weeks now before i even licensed ecm. sorry if it a dumb question.
what am i missing?