have desensitized knock sensor with resistor and toggle switch and still get KR on my scanmaster. Here are some readings on scanmaster, o2 at wot about 840-880 wot kr up to about 7 deg, inj pulse at wot just over 10 but drops a little, spark adv. 39-40 deg. Have new maf, opti, icm, msd coil, plugs and wires.
car seems to run rich at idle probably bad o2's gets 10 mpg. checked a few plugs they look fine tanish-brown in color.
95 camaro m6, cai, 52mm tb,bbk shorty headers w/ y pipe, no cat, magnaflow exhaust, 4.10 gears, tb bypass 160 stat, pcm4less tune.
any help apreciated

 

From dead cold, check for a dead cylinder using an IR thermometer.