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No check engine light? Does it behave different if it's warmed up compared to when its cold? Bad ignition coil pack might not show a code but can show the symptom you are having, sometimes you'll notice a power loss. Bad Idle Air Control Solenoid but that will normally throw an engine code. Troubling that the Ford store couldn't find the issue as I'd be certain it would show up on an engine scope or a starting system test.
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USN - RETIRED NUKE
Taunton, MA
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