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My truck has had a random skipping idle with rpms jumping up and down slightly on tach. It skips at any rpm range and very noticeable. I recently upgraded the injection pump because of the computer issues. This didn't help it out at all. I have checked fuel pressure and checked for air in supply to pump. It seemed to have started when i upgraded my injectors to 40hp injectors. I have replaced all seals on injectors and tubes. I did scratch a couple tubes. I did bleed air from every line at head. I don't know if the tubes being scratched would cause this bad of an idle? I can firmly say that from the lift pump to the injection pump is good. Im thinking it is down to connector tubes, injectors or valve guides/seals? I would be surprised if the new injectors would cause this though assuming they were pop tested and have new parts to them. Also the blue smoke is excessive during start up and will last for about 5 minutes before clearing up. It doesn't sound much like a miss (Like loosening line at head), but it doesn't seem to be firing consistently. Could an internal leak in the head (i.e., connector tubes) cause a weird idle? Truck starts great every time. Seems to drive alright. What do you think?