2014 300xs Motor Serial 1E052216 RPM: 5450-5900 depending on load and which prop I am running. Props: 25 and 26.5 bravo xs. Merc monitor gauge. Premium plus oil
Sportsmaster lower
Went out fishing today and did some idling around trolling for grouper (mostly under 1k rpm or 4-5 mph). Normally if I do extended idling it will just puff a little smoke on takeoff. The motor started to have a rougher idle and would occasionally die when being put into gear. When starting up, it would usually give a little puff of smoke and the rpms would surge up a little bit like it had excess fuel.
Thoughts? Motor runs great at all other speeds but the idle is a little rough now.