If you have swapped injectors and the problem is not following the injector it's not clogged. i remember reading this a while ago when you were about to pull the heads. Check for the pulse on the injector wire to be for sure that it's triggering the injector to fire. make sure the injector wiring harness is extremely grounded too. I am amazed #5 is still acting up, it's getting to me now.
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