1998 mercury 150 optimax dfi starting/idling problems

civicsi1279

Seaman Apprentice
Joined
Aug 27, 2008
Messages
30
I just started the engine today for the first time this season. I ran it in the driveway for about 20 min with no issues. I brought the boat to the ramp today and when I started it and wouldn't idle correctly unless I let it sit at 1500rpm. as soon as I would bring it down it would stall. I tried to leave it at 1500 and wanted to bring to the slip. after 5 min of moving in the lagoon, the engine cut off. it would start and stall, start and stall. could not rev the engine up. so I just kinda limped my way to my boat slip. so now it starts and stalls no matter were the throttle is set. any suggestions
 
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