Throttle Body

Hold throttle valves wide open. Disengage pump rod from throttle lever by rotating rod until tang on rod aligns with slot in lever.
Remove curb idle and fast idle speed screws and springs if necessary. Further disassembly of throttle body is not required. Throttle valve screws are permanently staked in position.
NOTE: Do not remove idle mixture screw plug unless it is necessary to replace mixture screw or cleaning and air pressure fail to clean idle mixture passages. If necessary to remove, proceed as follows:
Invert throttle body and position on a holding fixture with manifold side up. Using a small hacksaw, make 2 small cuts, one on either side of mixture screw plug location. Position a small flat punch on throttle body between cuts.
Drive punch down and break out portion of throttle body between the 2 cuts. Hold punch at a 45° angle and drive out hardened steel plug.
NOTE: Plug will shatter when struck. Remove loose pieces to allow the use of adjusting tool (J-28706) or thin walled deep 3/16" socket to remove adjusting screw and spring.
Turn mixture screw in carefully, counting turns needed to seat screw. Record number to be used in reassembly, then remove mixture screw.