My yamaha 150hp 4 cycle idles well and runs well above 2000 rpm. Around 1400 rpm to 1800 rpm it hesitates or runs rough until above 1800 rpm. I have changed plugs, fuel filter, fuel injectors and tested compression (all around 100 psi) with no change. Any ideas?
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F150 4 cycle Stumbles/hesitation around 1600 rpm
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