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Whenever you're having problems such as you describe, the first place to start is to check the codes, that's what the Onboard Diagnostics are for. You can check them yourself with a fairly inexpensive code scanner, or drop by a local autoparts store, some such as Autozone will scan it for you for free in the hopes that you'll buy any needed parts from them.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.