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Hi guys I have an 04.5 lly I it started missing and blowing oil out of the vent tube so I tore it down and found that #2 piston was cracked I put a new piston in and put the head back on started it up and had a knocking noise as soon as it fired ran a balance test and #4 was a little off so I swapped it with # 2 and it read the same what is weird is that if I shut #4 injector off the knock all but goes away any ideas on where to go next?
 

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Did you check the wiring harness?
 
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