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Started having rough idle problems with my '90 760 Turbo. First tried some fuel treatment in the tank as a hope. The went to the FAQ of this site. I started working through the steps on the FAQ section of the site - cleaning throttle body, cleaning the air control, checking vacum leaks.
I replaced two vacum hoses - one leading from the intake to a "T" with two large hoses connected, drivers side directly behind the engine; second from the intake to the turbo.
When returning to replace the throttle body gasket, I noticed oil in the hoses leading to/from the intercooler on both the throttle body side and the turbo side. What could cause this?
I've had the car about a month, ran like a top at first, now I'm concerned. 85k on the odometer.
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