One thing to check. When you get the high idle, slide the connector off the pins on the valve a little ways, and use a meter - carefully - to measure the voltage going to the valve. If it shows somewhere around 4 volts, the relay is trying, so replace the valve. If no voltage, replace the relay.
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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
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