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    Sky4601's Avatar
    Sky4601 Posts: 21, Reputation: 1
    New Member
     
    #1

    Feb 3, 2010, 07:01 PM
    What would cause my 99 Taurus to miss, and then run great, miss etc etc?
    It will idle up to about 2000 rpm, runs fine, starts coming down, running good, drop to 700/800 rpm, starts spuddering, does not kill. And I am hearing a loud hiss, like there is a vacume leak, somewhere between the engine and the fire wall.
    Fr_Chuck's Avatar
    Fr_Chuck Posts: 81,302, Reputation: 7692
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    #2

    Feb 3, 2010, 08:03 PM

    Moved to cars and trucks
    Sky4601's Avatar
    Sky4601 Posts: 21, Reputation: 1
    New Member
     
    #3

    Feb 3, 2010, 08:23 PM
    Thank you Mr. Chuck. I could not figure out how to put it in the right category.
    450donn's Avatar
    450donn Posts: 1,821, Reputation: 239
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    #4

    Feb 3, 2010, 09:57 PM

    Vacuum leak, plugs, plug wires. Bad injector, fuel filter, bad fuel pump. Heck even a weak battery can cause problems with newer vehicles. Probably far cheaper to pay someone to put it on a scope and run a diagnostic test.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
     
    #5

    Feb 4, 2010, 07:27 AM

    Possibilities:

    . PCV Valve Hose Emission Separator, which goes from the PCV Valve to the throttle body. Over time, engine oil that is evaporating though the PCV Valve deteriorates the rubber "L" going into the base of the throttle body.

    . DPFE Sensor hose leak.

    . Upper Intake Manifold (UIM) leak--replace O-rings.

    . Lower Intake Manifold (LIM) leak--replace O-rings.

    . Idle Air Control Valve (IACV) leak.

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