Ok first off I have a 97 LT1, 6 speed...I first had a problem with a missfire in #5 & #6..came to be a bad opti, replaced it with new, not remaned unit..Then came the code P0336- Crankshaft position sensor circuit, range or performance problem...replaced with a new sensor.. Now I continue to have the same code set...checked all the wires to sensor to see if 1 might have gottin cut, burned, or frayed...everything checked out fine...The car has a loss of power and whenever I really get into it bogs down and stumbles, until I get outta the gas...It's running rich at idle and tends to backfire when I lift off the pedel..Now I wonder if any of the LT1 guru's might have some insight to what I may try to look at next? The car has ony 62,000 on it minor mods, exhaust, cold air intake, vortech intake elbow...Please help a fellow LT1 guy out

 

Did you check the battery voltage on the pink wire? Be sure to measure it between the pink wire and pink/black wire with KOEO. Did you ohm the yellow wire to PCM?