Serial OG741767
Motor idles perfect. Starts easy. As motor reaches right at 3000 rpm it gets horrible miss and will absolutely not rev. While idling on muffs all three starboard side plugs stall motor when plug wire are removed. All 3 port side plugs have no change in idle when wire removed.
All 6 cylinders have spark. All cylinders were tested using spark tester set to 1/2".
Idle stabilizer and advanced module have both been removed. Timing set to 23 wot.
Port side plugs are wet starboard side are normal. Did notice a definite temp difference between cylinder heads as the problem side was much cooler.
I have ohm and dva metered everything and all fall right in middle of spec per merc manual.
I have tried a different set of ebay cheapo switch boxs with same results.
Only thing I haven't dug into are the voltage regulators. Could those cause this issue?
Losing my mind on this one any guidance would be greatly appreciated!