idle pulse

Discussion in 'General Chevy & GM Tech Questions' started by grog, Apr 13, 2009.

  1. grog

    grog New Member

    I have a 91 s-10 4.3L. I have replaced the m.a.p.sencor and the throdle pasition sencor, and I still have a pulse in the motot at idle. Any ideas on what it could be?
  2. ct9a

    ct9a New Member

    Have you checked for vacuum leaks?
  3. grog

    grog New Member

    Yea I did. I had to replace two vacuum lines. Pulse ia still there. There is also a dead spot in the throddle body at about 3500 rpm. Could there be a conection between the two?

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