this has me scratching my head a little. i picked up a 04 sport trac with a 4L SOHC to fix up and resell. the previous owner did take pretty good care of it. when i went to look at it, i did notice a little bit of a rough idle. he did say "it comes and goes" and he was right, it does. i did change the plugs (which looked like the originals) and wires (same originals) that made it a little better, but it still does it. i have also cleaned the maf, throttle body, new fuel filter and checked the air filter. i also checked for vacuum leaks around the intake and all is good. its weird, one moment it will idle rough then the next moment, it will be fine.
any thing else i should look at or test?
It seems like you have already taken some important steps in diagnosing the rough idle issue on your 2004 Sport Trac. However, there are a few more things you can check to further troubleshoot the problem:
- Idle Air Control (IAC) Valve: The IAC valve controls the idle speed of the engine. If it's dirty or malfunctioning, it can cause rough idling. Consider cleaning or replacing the IAC valve.
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