C1800; I understood the Idle Adjustment Screw to be damaged, and that's the straight blade adjustment screw, so that's info I included...I guess I misunderstood....
SL; ...in rereading, the statement "fethering the throttle at 40mph in 4th for very gentle acceleration" stands out...if it coughs with quicker calls for acceleration, that suggests the TPS may not be supplying contacts to enable enrichment pulses, (MAP sensor is able to keep up without them)...I suggest you check for and verify those 20 clicks with Ign ON. Also, have you checked Fuel Rail Pressure (under demand!)...if it is collapsing then there exists a supply problem...
Cheers
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