Was prepared to somehow get the vacuum line out of the booster, but the high idle stopped and went back to just plain lumpy.

Took the car to a shop and had a full SDS readout. No component malfunction but a recommendation to replace the four breather hoses and return for a smoke test if that doesn't help. Also recommended replace the EGR valve and pipe as it is generally clogged on these cars with 100k+ miles.

After driving the car, noticed that the lumpy idle is intermittent. Leaving the shop, there was a small amount of vibration at idle that I would have thought was motor mounts. Ten minutes later, it was shaking to the point where I couldn't understand how it could keep running.

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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