380SL Inconsistent Rich Idle and Run
 

1980 380SL, 165K miles. Have experienced rich and rough idle at startup, run and restart. Sometimes clears and runs good after warm up but other times seems bogged down with little power. Inconsistent during hot restart also. More common during hot weather but other times starts and runs very smooth with sufficient power and acceleration. Also seems to start better during damp cooler conditions.

Would appreciate any advice for troubleshooting.

Thanks,
Bob Hudson