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99 duramax throttle issues? heavy acceleration when barely pressing on the gas peddle

Discussion in 'Truck & Equipment Repair' started by GSS LLC, Dec 12, 2012.

  1. GSS LLC

    GSS LLC Senior Member
    Messages: 640

    Buddy bought a 99 duramax, and after you get up to highway speed, even the lightest touch of the throttle acts like you are at 3/4 throttle and accelerates rapidly. like its an on off switch. runs fine, just crazy throttle response. any ideas?
  2. jb1390

    jb1390 Senior Member
    Messages: 710

    I would guess throttle position sensor as a good place to start.
  3. durafish

    durafish PlowSite.com Addict
    from 02919
    Messages: 1,092

    They didn't make duramaxes in 99'.
  4. GSS LLC

    GSS LLC Senior Member
    Messages: 640

    well, diesel, not a duramax i guess. but a diesel, there is no tps according to the parts store, we already called for that.
  5. Mr.Markus

    Mr.Markus PlowSite Fanatic
    Messages: 5,782