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<p>[QUOTE=&quot;BoxCarKidd, post: 4865728, member: 151415&quot;]When it is throwing fits does it blow white- gray smoke out the exhaust which may be speratic. On cold start ,With low air pressure, does it surge and blow smoke but clear up at around 60-90? PSI?&nbsp; If you get a widget to plug into the barometric pressure sensor harness ,which tells the computer you are above 5,000 feet or so, and it runs 80% better ( which is for test purposes only). Or it starts showing SRS &amp; or TRS codes but nothing related corrects it.&nbsp; Then after lunch or tomorrow it runs great, those are all signs for what I am talking about.</p><p>When what ever shop leads you into replacing parts ask them if that will fix it? If they don&#039;t know hit the road.&nbsp; There is a lot of middle ground and I came to understand that engine harnesses should probably&nbsp; be replaced as regular maintenance at some point.&nbsp; If there is a Detroit Diesel dealer area in your area you might be better off there. This truck is duel draw duel return. Trash in one tank should not cause this. I would lean more toward Heavy Hauler&#039;s idea. Maybe search scanners diag tools, I thank cowpie noted an inexpensive one that would&nbsp; read codes plus some. With that you could see what is happening when it is cutting up.&nbsp; If you do not find that shout out to him (PM) he is pretty sharp on a lot of that.[/QUOTE]</p><p><br /></p>

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