When's the last time thermostats were replaced? Poppet valve? Water pump impeller? I've got a guru Merc mechanic if you want to pm me. Just rebuilt my 94' 2.5 200 Efi...
'98 Tr20 Triton completly updated & rigged, 05 Magnum c-channeltrailer
'94 Merc 200Xri completly rebuilt & noseconed/low water pickup lower unit.