Cool 2001 F150 Check Engine Light Flashing Ideas. Web i am having the same issue. Lately it has been running awful all of the time.

The exact nature of the problem will need to be diagnosed by a mechanic, but it could be something as simple as a loose gas cap. What's up guys, i have a 2004 fx4 with the 5.4. Are you getting worse gas milage or having a harder.
