Engine shakes and causes my check light to start blinking?

Its a ford f150 2005. I would drive to work and engine would be fine but then I drive it back home after 6 hours and the engine would shake and prevent me from going faster. Thats when check engine light starts to blink.so far i've changed all spark plugs and two ignition coils #2 & #6. I also changed the oil. What els could it be?

If the light is on, the OBDII system has fault codes that need to be read. You need a scanner.

You should have started with having the code read [check engine light] before you spent as penny on parts. The auto-parts store will read the code for free.

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