Ok...truck is currently in the shop, but they are kinda stumped....anyone see this problem before.

#1 Cylinder is missing...They have diag computer which can monitor all the cylinders efficiency... 2,4,6 are right on...#1 is almost dead...#3 and #5 are ok.

- They checked/replaced #1 injector and it's firing
- They checked compression and it is good
- They checked valves they are good
- They checked spark and it's firing
- They checked cam timing and it's good

Any ideas what they might be missing?

 

bad plug? bad wire? ngk is the best for the 3vz stuff imho. Something with cap?