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Old 06-03-2000, 06:47 PM
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EricSilver EricSilver is offline
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Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,249
I should have checked before posting this same topic elsewhere, but too late.

I have an 89 260E and started using 89 octane about a month ago. Presto: the shudder at idle is essentially gone.

In the past year, I have replaced my ignition coil, overvoltage and fuel pump relays (not for the rough idling though) but still had the idling problems. Switching to a lower octane to save money seems to have had a very happy, and unexpected, side affect.

Eric Silver
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