vacuum leak

  1. I

    P0171 Error Code; upper intake manifold gasket replacement

    Hello, First, some basic information about the car. 1998 MY (Model Year) 146k miles 3.8L L36 OHV V6 engine What's been replaced recently? Fuel cap Vacuum throttle body to fuel regulator hose 2 front wheel hubs with ABS Recent history 9 months ago, a mechanic told me it needs a new upper...
  2. Z

    Engine surges on start up 2000 Alero 3.4L

    Every once in awhile my engine will rev up and down a few times when I start the engine. I've read it's a vacuum leak. Is that all it could be? Why doesn't it do it every time? Where are the common places it could be leaking from?
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