Need to know what year 4.3L you have to answer that.
You don't need a diagram to find spark plugs on this engine. Follow the plug wires and you will find the plugs.
.43
.43 is the gap
.43 gap
43 thousands of an inch
the stock spark plug is the ngk ifr6l11 gapped at 39 to 43
It's .39 to .43
.38-.43 with .40 ideal for idle and highway speeds
No, a faulty knock sensor will cause a code 43 normally. check for spark, diconnect a wire from a plug, install a plug in the wire, lay it on something metal, have an assistant crank the motor and watch for spark...
Don't really know because the manual states on 1-43 0.0048 but also states 0.0035
Code 43 is listed as Electronic Spark Control Circuit
Between 40 and 45 on the gap gauge. Start with 40. Try 43 if not happy, then 45. If 40 to 45 does not perform correctly, there is something not right.