injectors cutting off

[06cumminspower]

i just changed the #7 injector and i was putting the valve cover back on (while engine was running and running perfect) and when i tighten the back top bolt on it cuts off the two back injectors 7&5 and i can loosen it and tap on the cover and they will work again, i can get it a lil more than finger tight but tightening it completly shuts them off. would this be a faulty valve cover gasket or injector harness although i couldn't see how the harness would be affected by thighting the cover?

 

[powerboatr]

UVC harness shorting out sounds like.
there is a new harness and protector available
or some have fixed the harness

 

[Zookie400]

uvch is very possible, although you say it cuts out when you tighten a bolt, wich makes me think its the valve cover gasket.

 

[94f450sd]

thinkin the same as zookie.did you replace the gasket?sounds like a bad pin in the gasket