I have a 1986 124 300sd. I was changing out the glow plugs with the glow plug reamer kit available at MercedesSource, Awesome kit everything was a breeze lots of carbon build up. The problem arose on the test drive when the car accelerated uncontrollably! Upon close inspection I noticed that two hard fuel lines had been replaced, (by the previous owner) and in working the throttle linkage noted that ever so often the linkage rubbed on the fuel lines causing the throttle to stick in the open position. Have you come across this before and what do you recommend my next course of action be?