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I had an 01 Millenia with a similar so you may want to track down the following: Check that the distributor is intact and properly sealed; check all spark plug wires and the plugs themselves; If the check engine light is on get the code read. My Millenia ran fine at city speeds but as soon as I would get on the highway and accelerate, the car would begin missing and losing power. My distributor ended being cracked and the spark was escaping and not making it to the cylinder. Good luck! The 2.3L has coilpacks,no distributor. If it was a fuel filter it would cause hesitation at lower speeds as well.

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Q: What is the cause of bad hesitation only at high RPMs on the 99 millenia with the SC Miller Cycle engine could it be a fuel filter?
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