Possible cause -

As MB Doc advised me, some input to the ECU is telling it to shut the idle control valve down. He recommended checking the airflow meter, decel microswitch, and throttle position sensor.

It might also be a "sneeze" in the OVP relay.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe