Poor Running Mariner 200

Joined
Jul 19, 2006
Messages
71
Need some help from the crew. I have a '91 200 HP Mariner Offshore. The motor was underwater, but pickled and was running great last week. Now I have developed a problem where themotor will not start unless in fast start. It runs fine in fast idle, but cuts off as soon as I bring to Neutral. I pulled 1 carbuerator off and it looked fine. I am getting spark at all 6 plugs. I am running off an external fuel tank to eliminate the possibility of contaminated fuel in the inboard tank. Any ideas where to look next?
 
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