Omc runs rough when warmed up

[Inthebilge]

87 Omc runs rough when up to temp and eventually stalls. Engine temp is normal, risers are getting hot. I replaced exhaust, circ pump, thermostat.

 

[KLFrank]

If all has been replaced and still overheating, check hoses for debris. Replace hoses with clear to see if you are getting flow. Have you ever had a impeller come apart? If so you might have a blockage

 

[Inthebilge]

Thanks, clear intake to thermostat housing clear and good flow, clear hose from thermostat housing to exhaust manifold is good flow but air raided