Most prominent when cold and when under load, it misses and pops when trying to accelerate. Had a break in a lead on cylinder 3 so when lead was removed the internal connector stayed on the plug so we thought that was the issue, brand new set of leads and problem is still there. Have checked plugs with another set and problem does not change. Am leaning towards a problem with one of the coils or maybe ecu.
Any ideas and does anyone have a spare coil for these?

Brad