Got a 1997 mariner 175 efi. Sn# 0g549797
Just got thst boat, very difficult to start motor. Will crank and try to start, occasionally starting but slowly dying right after.
Once i do manage to start and keep it running, it runs very rough until it warms up then it runs great.
Checked throttle position sensor it was reading 0 so i set it to .263v per the manual (port temp sensor disconnected while setting). Didnt seem to help.
I then tried unplugging the port head temp sensor and that seemed to solve the issue. Started and idles just fine.
Any ideas what the problem is?