1990/305 Engine/Trans Question

Discussion in 'GM Powertrain' started by Air Force One, Nov 19, 2009.

  1. Air Force One

    Air Force One New Member

    Just had my 1990 Chevy 305 Engine Fuel Pump replaced since it was surging up/down and running erractically. Before this the trans was shfiting very hard from 1st to 2nd,,, seemed to shift a little smoother when it warmed. Now since the fuel pump has been replaced and the engine runs perfect it nows shifts 100% better. Anyway the fuel pump could have done that makes it shift smoother now??? Stumped! Thanks:rofl::sign0018:
  2. azdrtdog

    azdrtdog Epic Member 5+ Years 100 Posts

    YES you have a t.p.s. throttle position sensor that tells the tranny how hard to shift dep. on throttle pos.the weak fuel pump made the motor run weak/ more throttle than nesc. when running strong harder shift

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