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03/05/2021 7:28 am
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Ford 500 2006 front wheel drive duratec v6 mileage 180,000 Above 70 degrees outside temperature driving above 45 in high gear rpm jumps 200 rpm randomly every 5 or so seconds. All winter it’s fine. My mechanic found nothing wrong. Trans guy over the phone says a have a warped valve body wants $4000 . No way. Trans shifts great. I did replace the throttle body years ago with after market brand. What could be wrong? Thank you
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03/05/2021 7:40 am
Sounds like the aftermarket throttle body to me. Try cleaning it first, if it still does it, try swapping with an OEM one from a junkyard & check if it fixes it.
It could also be a misfire -
https://carkiller.com/scottykilmer/qa/misfire-4/
