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Hi, my name is ***** ***** is caused by either a leaking injector, that leaks down into the cylinder as it sits, and then it has to burn off the extra fuel in the cylinder, then runs smooth the rest of the day, or it is loosing it fuel prime overnight, and then once it fills the lines with fuel, it runs smooth, when its running rough is there any grey smoke coming out the tail pipe?
ok, if there is no smoke, then its most likely a bad check valve in the fuel pump, causing it bled back as it sitd overnight, hpw long does it run rough on first start up?
The egr valve does not open when its idling, so I dont think the egr is the problem, if the pump is new, then this rules out thecheck valve, when was the pump replaced?
we need to see what it is on the first start of th morning, to see if its losing the prime overnight,Tim
Did you check the fuel pressure on first start up?
it shou;d come up to at least 35 psi, as soon as you start it,Tim