It is efi the boat doesn't t sputter at all just shut off about throw you in the dash. Just changed the two square blocks in front of engine the ones behind that plate that bolts to the front. Had a boat mechanic come out to my house and test them one was black and burnt the other he said was bad so we changed them . It runs great other than this. Starts right up cold or hot. I called him at his work and he said he would scratch his head sone and get back. He works at a Mercury dealership
