Mercury 150 EFI Problems

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Stator coils. Magnetic pick ups can be bad. Is it throwing an alarm? There should be a ground pad where the efi is grounded as well as Cdi make sure the grounds aren't loose and have good metal with no corrosion. U said it WAS running bad. Bad how? The fuel pick up hose may not be holding together causing air causing efi to miss and **** off. Checked fuel pump? Find it open end pick up make sure ur getting gas to it then plug it back up then open end sending side and make sure ur getting good fuel out of it. May take 2ppl one to crank it one to check it. Pm me I've went thru so much issues with big motors I am almost a pro... Lol. That ground pAd was my issue. It will send CPU false signals like "efi not enough fuel pressure" shut down. Also when you turn key on not start see if your alarm light flashes. Does it have a throttle pos. sensor? Or fuel pressure sensor on or around efi?