One is for crank sensor
the other one is for the Knock sensor (round the other side of the block)


Have you still got 4x4 ECU??

if so, you are aware that 2wd Throttle position sensor reads the exact OPPOSITE of 4x4 one (at 100% when 4x4 one is at 0%)

dont think the knock sensor being un plugged would have too much effect.