Codes for F150
My engine light blinked 7 times when I turned the
key in the ignition, but not all the way and I counted
the blinks while in park.
You need to read and watch this, URL below, copy & paste to new browser window. It may be serious.
Here it is: https://www.carcarekiosk.com/video/2013_Ford_F-150_XLT_3.7L_V6_FlexFuel_Standard_Cab_Pickup/check_engine_light/diagnose
The blinky thing is for the old OBD1 codes, not for your truck which is OBD2.
Have it scanned for trouble codes at a local autoparts store and post the codes here or do a Google search for problems.
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