f 115 running rough at idel

[spearjunky]

f 115 running rough at idel but fine at speed when i stop from running at 4000 rpm and goto idel i get fuel from the exhaust and it starts running rough any help would be great don't

[rodbolt17]

first check the engine oil.

then check for which cylinders are involved.

[spearjunky]

checked oil it was high or making oil changed fuel pump problem fixed also changed thermostat, plugs and oil and filter thanks for looking

[spearjunky]

Changed plugs, fuel pump,thermostat ,It will run fine at speed slow down and it runs rough and might stall then it's hard to start,thinking maybe needle and seat in vst tank sticking ,Can't get any boat repair places to call me back to fix plus want to put new timing belt on it