'99 Silverado hesitates on acceleration

Discussion in 'Performance & Fuel' started by Kerchak, Jan 12, 2009.

  1. Kerchak

    Kerchak New Member

    My '99 Silverado 1500 hesitates upon light acceleration. It idles fine, and runs fine under heavy acceleration. Sometimes it will not start right away, but most of the time it starts fine. I replaced the fuel filter, and then the fuel pump. No change. I thought it might be clogged injectors, so when I went to buy injector cleaner at NAPA, the dude said there was a problem with cracking intake manifolds. The plugs have less than 25,000 miles on them. Anyone have an idea?

  2. dwill3015

    dwill3015 Epic Member 5+ Years ROTM Winner 1000 Posts

    What motor do you have? I am betting if you change out your intake to an aftermarket one such as a K&N that it will give you better low-end response and no more hesitation. We did this to my Wife's 2001 Suburban w/5.3 and it made a world of difference!
  3. Kerchak

    Kerchak New Member

    Sorry. It's the 5.3. I've already thrown hundreds of $ at this problem, with no results. I just want the thing to run right. I'd like to know if it's a vacuum leak, clogged injector, etc. Yacolt, Huh? I live in Kelso.
  4. vncj96

    vncj96 Epic Member 5+ Years 1000 Posts

    Have you checked the ignition components? Plugs, wires and full distributer. A hairline crack in the wires or distributer rotor can cause all kinds of problems including what you are describing
  5. dwill3015

    dwill3015 Epic Member 5+ Years ROTM Winner 1000 Posts

    Very cool! How is the flooding up your way?

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