1999 Ford F-250 Super Duty Questions

Answered 1999 Ford F-250 Super Duty Questions

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Replaced intake gaskets, no change. switched COP's and no change.
The check engine light came on and stayed on for a day and then it went away and came back on two days later. I haven't found anything wrong with the engine. Is it just a bad sensor?
Replaced chasis wiring harness, engine harness because of badly damaged(bare) at plugs. Replaced multifunctional switch for turn signals and flashers because relay was buzzing.
It straightening out it doesn't do this all the time.
Auto shop says 2400 dollars to replace my head gaskets, does the entire engine have to be pulled or can I do it myself?
I think it has something to do with the alarm system & door locks. I have no power going to the solenoid for the starter but I can turn ignition switch to aux, touch terminals with a screwdriver & it starts & runs gre...
engine cranks but wont turn over
I started my truck after it sat for a day from the cold weather. It ran fine when I used it last. Now my abs and brake light is on when I start it and it stays on. Need help please.