i believe it is for the IAC valve. (idle air control) valve. cleaning with brake cleaner can solve the issue. or replacing completely.
knock sensor
I have a 92 s10 blazer and my code 43 was fixed by replacing the knock sensor. so maybe check the knock sensor and the wiring from that to the ECM.
any from 88 to 98
probably the ignition switch if you are refering to the starter solenoid.
knock sensor
Owners manual, positive.
System Normal
ESC / Electronic Spark Controll Circuit. and the knock sensor signal.
43
35/43 = 81.4%
43 greater than x - 43+x 43 greater than x plus 35 - 43+x+35 43+35+x=78+x
35/43 = 0.814.