bogging issue

[hl]

I have a '83 mercury 90hp that is bogging when full throttle is applied. It cranks ok and will run great at low RPM. A mechanic tell me the number 4 coil is irregular(jumping around) and could be causing the problem. I believe the problem is in the carbs. I have been through all three carbs twice and they seem to be good Replaced the gas lines and primer.What are the chances the problem is in the coils?

 

[racerone]

Coils can be switched from one cylinder to another to see where the problem goes.-----Put # 4 in the #1 position and #1 into the 4 position.-----Test compression on all cylinders too.

 

[hl]

I have already checked the compression; 122 - 120 on six cylinders. The coil he was talking about was showing inconsistence reading as the rpm increased. I am not sure if this one coil could cause such a bad bog..

 

[racerone]

Ok then , you or your mechanic will have to do some more trouble shooting / testing / inspection on this motor.