I really think the new valve the mechanic put on the valve cover is defective. If the Bowden cable runs off of the throttle and is that bicycle like cable on the valve cover, then the shift valve on the valve cover he replace controls it by vacuum. I took it apart and looked.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup