96 intermittent rough idle.

93f250idi

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I just picked up a 96 f250, 7.3 zf5 2wd. Has 353k miles but it seemed to run good. Now when I come to an idle it will miss/shake for about 5 seconds then clear up. I ran a cylinder contribution test and an injector buzz test and they both passes. It had some random codes but there not there anymore. Any ideas?
 

79jasper

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I would start with a fuel psi test.

Then look at the IPR.

Mine sometimes has a rough idle. More of a lope really. Not a big deal to me, pretty cool actually. LOL
 

93f250idi

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The lope is pretty common on a powerstroke. Mine is more of fast miss and sounds like crap lol.
 

93f250idi

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I figured out the problem, my truck doesn't have a miss. The dmf is wore out, and causing the truck to shake. I pulled the inspection cover off the trans and moved the flywheel back and forth and it made the noise my truck makes when it shakes. So my guess is that the flywheel being wore out, has it out of balance.
 
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