2002 mercury 115 efi starting and idle issue

[marclind1234]

Hi, started having an issue last week where i cant idle and motor won't start in neutral unless I click the shifter to give higher revs. Once started runs great but once I stop it either dies or idles very rough. In my research seems likely culprit is the Idle Air Control valve.

Anyone else have suggestions? When this started to happen I had just added seafoam to the gas. Is there a chance it might have lossened some dirt and clogged an injector/fuel filter? I'm thinking this would cause more issues then just what described above and seems like this may just have been a coincidence.