Seems to be on number 8. Was running great then just started popping in exhaust on right side at idle. Runs ruff. New plug wires and Had injectors cleaned. No change. Fuel pressure steady at 45psi running (for DANA exhaust) pulled head checked valve train (30hrs on head job from broken spring) inspected car pushrods and all is well. Engine seems to miss on Rt bank. Swapped crank position sensors. Still pops and intermittently stumbles. At my wits end. Don’t have a merc scanner. No codes on my Bluetooth smart craft

Did the injectors go back in the same cylinders?
Who cleaned and flow tested, have a test sheet?

Dr injector did them they are all within spec Now. Was way out. . No real change from before cleaning and after.

Without a techmate/scantool you can compression test cyls to make sure engine is ok. Your FP sounds good. Need a techmate and someone who knows how to use it. You will be able to test coils and spark under load to pinpoint cyl giving u the problem.

What plugs/wires? Make sure you have real plugs and not china knockoffs with correct gap.

They were WAY out yet no change before or after, that doesn't sound right

Were the injectors reinstalled in their same cylinders?

Maybe move some around to see if it moves