An engine cylinder misfire has been detected in the # 8 cylinder
The Ford diagnostic code 316 is a misfire detected at engine start up.
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Trouble code P2106 means: Throttle actuator control (TAC) system-forced limited power mode
On the Starter
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This cannot be done without the use of the Ford diagnostic software. You will have to take your vehicle to a Ford dealership to have this performed.
A 2005 Ford F150 can be purchased from Edmunds used cars who currently stock that exact model. Kbb and the Autotrader are also two valuable places to check.
With the owners manual
6.5
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In your car manual