I have a 2001 4.3 vortec in a S-10 Blazer that I have that seams to be very sensitive to timing. It is stock except for a cam from a mid 90's CPI 4.3 and 36lb injectors for a tail pipe turbo that I want to do down the road. I have been trying find a missfire under lite load also that be causing my issue also but not sure. I have replaced the 02's, distributor, cap, rotor, cam sensor, wires and plugs with new ones. Swaped out the MAF, throttle position sensor, IAC, EVAP soleniod and MAP sensor with known good ones. Set cam sensor to 0deg. Smoked the intake for leaks and found none. I have pulled as much as 12degs of timing out from the stock tune in places to prevent knock. Could someone look at my tune and see if there is something that looks like it could be causing my knock issue?