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I swapped the #1 injector with a good used one and it smoothed out. I haven't driven the truck yet but it idles smooth in neutral and in gear. All the temps on the exhaust manifold were the same. I tried to blow through the bad injector nozzle and couldn't but could blow through a spare one...

I would change the hoses and o rings in the selector valve, but the problem didn't go away when I ran the truck on a 5 gal fuel can hook directly to the lift pump. I changed the overflow valve with a known working unit, no change. I checked all the ports on the exhaust manifold with a IR temp...

Went off-roading a few months ago and on an extreme angle I think sucked some air. The truck never died but sputtered for a while. The rest of the day it would intermittently sputter again on angles. Drove it home with a slight lack of power due to the sputter. Came home, change the secondary...