So the wires are 15 years old and subject to high heat and vibration. Also you need to get a code reader or have it done at autozone or orielly etc. They don't charge to read codes.
Need to get a can of gumout and with it idling spray around the top of the upper plenum to see if you have a vacuum leak if you have a leak it will either idle up slightly or kill the engine very very common on the 3.0 Taurus ,little more information would be helpful like how many miles are on the car
SOURCE: high idle and misfire cylinder 1
This could have several causes however the most likely cause is either a throttle positioning sensor or the mass air flow sensor is bad. To check either of them you need to have an OBDII scanner that can read voltage. It would be best to send it to your local GM tech to have them do an onboard diagnostic rather than spend alot on parts that may not solve the problem.
SOURCE: 2005 Ford Taurus Sputtering
stickingvalves collapsed lifters bent push rods fault ignition or damadged spark plug wires start it up at night look under the hood for sparks jumping from wires replace fauilty wires
SOURCE: Have a 1998 F-150 XLT, 4.6 (6) Windsor Engine.
Could be the coil pack should be read in ohms about 7 to be good
SOURCE: 2002 Ford Taurus 3.0 engine misfire at 1000 R.P.M.
Have you checked your camshaft sensor? It's possible that the vane on the Synchronizer is misaligned.
SOURCE: 2002 Ford Taurus SEL, DOHC Misfiring
Disconnect the battery completely, try turning the key with the battery disconnected. Put the battery back together. The check engine light should be off now..
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