I was reading an old post of someone having a problem with there F250 starting and running rough but then it goes away. My 2005 F250 does the same exact thing. I used a voltmeter and tested the FICM to see if it had between 46-48 volts like someone else had suggested. When I tested it, it kept coming up with 56 volts. Can anyone tell me if i am doing something wrong or if it is bad? Thank You.
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Welcome to FTE Dobbs8 We have a complete FICM Test article for you to read through, maybe this will clear up your question. Also check out the PDF FICM Guide