Recently I and a buddy of mine swapped out a 300
straight 6 engine from a 1980 f150 with a different
one that does run better but at this point whenever
you go to shift it idles really high until you let off of
the clutch. What could this possibly be?
Maybe the idle speed needs to be adjusted. Also check for vacuum leaks.
Also check the throttle linkage. Make sure it isn't binding or sticking. HTH. -Jim
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