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Volvo Penta MB20B stalls in idle when warm

Babaganoush

New member
Volvo Penta MB20B with Weber 34ICH carb. Mechanical fuel pump.

Once warm, stalls when in idle, recently also in low revs above idle. Works well in higher revs. Cold start is reliable but takes >30 seconds of churning. Also cold idle is OK. Starts warm right after stalling with throttle opened, but really difficult after a while until properly cooled down. Fuel lines and float bowl aren’t ‘vapor lock hot’. Pilot jet is clear.

Any help is greatly appreciated - approaching the dock with 50/50 chance to not be able to brake is just too much suspense for me to handle.
 
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