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looking for the actual difference between Idle Air Control Valves: Delphi W0133-1682106 (listed for vehicles thru '91) vs. Delphi CV10033 / ACDelco 217-437 (listed for vehicles '92 -'95) ...not sure of ACDelco part number cross reference for the Delphi W0133-1682106, possibly 3797-05006145 or 17111460 ? Thanks for the help Maybe this would be easier... what's the actual difference between ACDelco idle air control valves: 3797-05006145 (or 17111460) <- listed for vehicles thru '91 vs. 217-437 <- listed for vehicles '92 -'95 Thanks for the help