Went to Advance to test a new TPS; they didn't have one.
Tested a '90 'K' platform [V8] TPS (new, off the shelf), and got almost identical results.
THis calls for some modification to the throttle body / linkage cam pulley...
Which is of course, the answer to the :
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Vettetech1, throttle position sensors are famous for off idle sag.
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Ideas???