Hey, I have a 2004 chevy silverado with the 4.3L V6 with 94000 miles on it. Basically it was running fine one day and the next day it wouldn't start. When I try to start it, it would turn over but not crank. I checked the fuel pressure and it is good. So I then proceeded to replace the Spark plugs, spark plug wires, distributor, crank shaft sensor, Pcm, Icm, Coil, Ignition relay, fuses, Checked all major grounds and they are good. Also did yank test on harness and that didn't do anything. The only thing that I can think of is that the harness is bad.. but before I change that, I wanted to maybe get some other opinions.

 

Are you getting spark at the sparkplugs? When you pulled the plugs were they wet with fuel?