I finally found the exhaust leak and replaced the exhaust manifold gasket with great results. The old gasket was in pieces after being in there for 20 years. Upon taking it out for a first drive the auto transmission shift from first to fourth was much smoother especially from from intial takeoff . No more back pressure loss and it sounds like a diesel Instead of a steam locomotive going down the road. On to the next repairs ha ha Hans.

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A couple of Ford pickups F 150,250, 350 missed.
1983 240 D 256,000 miles ,auto, ac.