Recurring Transmission Problem
My '87 300E seems to have a recurring problem with the vacuum line from the transmission to the manifold getting clogged. This problem is then follwed by the inability to shift from lower gears to higher gears.
My question is is what is causing the line to get clogged and how to prevent this, or at least minimize this in the future. I recently cleaned the line out approx 3 months ago and now I have to do it again.
Any ideas ?