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Discussion Starter #1
Well, after a long and frustrating path of searching for the cause of the occasional misfire on #8. After paying for a smoke test, discovered that I had a bad vacuum line that was playing havoc with my fuel mixture.

Gotta love the $simple$ fixes!!!

Idles and runs smooth once again. Did not realize how rough it was actually, I guess you get used to some things ;)

The next step was going to fun a compression test on that cylinder, hopefully, that wont need to happen :)
 

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What line did you find that was bad? I checked all the common things like plug, wire and coil all are good, but I'm still getting a miss fire on #8
 

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Have you checked for oil in your plenum? The 5.9 engines are notorious for this and it will cause misfires on the rear cylinders.
 

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I just looked down inside when I open the butterfly I don't see any oil it's seems to look dry down there
 

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Discussion Starter #5
Sorry for the delayed response, not sure which line it was - the shop replaced the whole thing with a new one. It had slipped off once before.

The "air sucking" noise could be heard when the truck was running.
 
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