u/AlJMueller

This has stumped me. Hope someone can help out.

Starts perfectly. Revs great. Then when shifting into gear it stumbles on acceleration. then when shifting back into park the throttle stumbles when pumping the accelerator.

Throttle linkage is good. Control fuel pressure is 68psi. In series fuel pressure is 50psi through the WUR. New fuel pump and filter.

AAV is inop which explains the high idle but I can’t see how that would cause the acceleration stumbling.

Smoke tested no vacuum leaks. Did the starting fluid trick around the injectors and no rpm change. Idle control screw was adjusted. Brake booster is good. No pedal kickback after engine shut off.