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1995 Mercury 175 EFI running rough

Shemp

New member
Hello,

My 1995 175 EFI has been having some issues. Occasionally the motor will suddenly run rough as if half of the cylinders don't fire. It occures most of the time right after startup and throttling up to go on plane. Other times I will have to let it cool down for 20-30 minutes for it to run normal. Other times it will correct itself suddenly and run fine most of the time but it is occurring more often. This has never happened at full power.

Any help on figuring this problem out is greatly appreciated.

Thank you in advance,
Shemp
 
When it happens need to check and see if it has lost a bank(side). If so you will need to test stator and switchbox. Is it overcharging by chance?
 
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