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Q: What could be causing the 3rd and 6th cylinders to misfire? on 2004 Ford Taurus

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My 2004 Ford Taurus seems to start ok, but does not run right. When you press on the gas the car seems to be starving for fuel and pauses for a moment before going again. The RPMS drop and then go back up suddenly the harder you press on the gas pedal.
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Common problem is vacuum hoses! Also depends on which motor you have. Need to know exactly which! Pushrod or DOHC.
Idle ok, smooth or rough? There is a vacuum circuit i think that pulls vac. from those two rear cylinders, have it checked IF rough idle and surge is present also. (Possible!)