360 does not run at idle

[bjanakos]

Had the boat laid up for a couple of months on the hard to do some maintenance. I launched it and now one of the motors is having some trouble running at idle. It's fine above 1000 RPM and I don't hear any misfires.

I'm thinking spark or fuel, and probably leaning on fuel since it was laid up. I'm heading back tomorrow and tossing on a new cap/rotor, new fuel filters, water separators, and dumping a few cans of sea foam in the tank. Any other suggestions or known root causes for this condition are welcome.

[prowlersfish]

I would start with fuel likely the carb has some trash ,water or varnish in it

[Paul]

+1

[Lance F28]

It sounds like an old fuel issue. Assuming it's carbureted it may be a gummed up idle jet, a good dose of seafoam will probably clean it out.

[oldboat1]

might be the choke sticking. Some carb spray for the jets (sometimes helps), and some WD-40 for the choke linkage.

[AlphaJustin]

I'm with the other guys you got sediment in the idle jets on the carb.

[44Ydnar88]

On an edelbrock or Carter the idle circuit is in the primary Venturi, this will cause alot of weird idle problems, zoom in on the circle

[bjanakos]

Thanks for all the replies. I replaced the fuel/water separator and pre-filling it with fresh fuel. No love, so that eliminated bad gas. Then I tackled the next easiest job - the cap and rotor, and viola, back in business. Several cans of seafoam added to all the tanks for good measure.