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Is it drivable? What has been done to it? How many miles? If the CEL is on you have codes. If the PO was throwing parts at it he must have been guessing, and that gets expensive and usually causes more problems.
If you can get it to me I have scanners that can do a buzz test and cylinder contriburion test, and I'm in South Lyon
I have a 2003 F350 dually i bought off a friend. it does the exact same thing. if i start it everyday it is ok, but just ok, still have to run for a while before it runs good. if you dont let it warm up for a long time and you try to drive it, it viberates very bad at times. no matter how hard you press the peddle the responce can very from not much when cold, to normal when ran a while. a while being 20 min, maybe longer. I used my dads edge programmer to adjust increase HP and it did help, but not enough. I unplugged the injector harness one at a time while running and when i unplugged the passenger side it died, so i knew my rough "running/idle" is mostly from the driver side. i replaced the injector harness as they are known to burn up. Still rough run/idle. it appears to me that i have an injector or multiple injectors bad on the drivers side. given i have 260,000 miles they are all probably limping along. given the rough starts i would guess injector O rings are bad allowing fuel to leak off. O rings may by time, but limited time. I hate to purchase 8 new injectors. any one have any advice? used to be able to purchase rebuild kits for them, can you still and where? anyone have any experience with aftermarket injectors? will an injector buzz test confirm my thoughts about needing injectors 100%? I will pass along anything i discover. my last thought is, can a person take the valve cover off and unplug one injector at a time to see if there is a performance difference? i know oil will go everywhere, but does anyone see a negative affect this would have. then i could pin point the exact injectors and just replace them for the time being, before i replace them all. test like spark plugs on a gas car. if no performace difference when unplugged then that one(s) are bad.
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