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Jerry, Drive to a good shop. So many things can cause reduced power light unfortunately. The first step would be to get the truck hooked up to a scanner/computer and have the computer scanned for trouble codes. One thing that you could try is to drain the water from the water separator that is mounted on the frame under drivers front door. If the PCM picks up on water, power is reduced until water is removed/drained. It could be an exhaust sensor that is reading faulty. Unfortunately from here its impossible to tell you exactly what the fault is because there are just so many engine sensor inputs that could cause your problem. Check the attached links, forums,instruction and guides, Good luck
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code P0304 cylinder #4 missfire the test is somewhat long, you did the right thing with the plugs and wires, that is were we would have started also but now that, that did not work it is time to go to work,,,here is the test for the code.....good luck
holding the gas pedal to the floor while cranking shuts off fuel flow to clear a flooded engine. Check for injectors staying open too long. Is check engine light on? If yes, get codes from free scan at Autozone.
Forget any Ford Dealers, you need to find a shop that Specializes in diesels. You should be able to find one in you area. Any shop that does a lot of light diesel truck work should have someone with the knowledge to get you going. Call around to a few shops and see who they refer their "Problem Child" diesels to.
when you get a code the PCM will keep that code and till it get easased. you need a scaner or disconect your battery for 1h. this should clear your codes. when the battery is disconected don't sit in your can. the air bags may deploy if you hit the steering collem or a sensor to hard. just let it sit. reatach your battery then try to start your truck. if the codes are still pressent you make need let the car sit for longer or bit the big one and get the shop to do it.