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Okay so I finally got the new computer, got it in today and the high idle went way, drove the truck about 20 mile and so far no high idle. BUT still has its rough idle, it's not noticeable while your moving faster than 10mph or so but anything less obviously keeps the truck at a very low rpm...

Sorry been busy this week, new ECM will be here Monday, and the cruise control is vacuum I believe, it has a vacuum line going to the cruise control unit, what would that have anything to do with my issues, just wondering.

Okay, last night after I posted I went up to my buddies that let me try the other ECM, this time I was only concerned with the high idle, swaped out the ECM with his and started the truck, ran very rough but it did not idle up, I let the truck run for about 10 mins or so to warm back up to see...

When I try a WOT test, I am assuming to do this while the truck is in park and not moving???? I did the apps test on the truck while it was running, and there was no fluctuating voltage while in ran rough and no increase in voltage when it idled up on its own. I called Blue Chip Diesel and...

Sorry for the one huge paragraph, yes I read through blue chip before and tested the apps and it tested out okay with an analog volt meter, and yes I changed the cummins ECM on the block with another truck and that didn't change anything. I have very minimal smoke, barely nothing, so I am hard...

Sorry for the one huge paragraph, yes I read through blue chip before and tested the apps and it tested out okay with an analog volt meter, and yes I changed the cummins ECM on the block with another truck and that didn't change anything. I have very minimal smoke, barely nothing, so I am hard...

Also to add that it runs rough the minute you start the truck regardless if its cold or hot, only when it's hot with it instantly want to idle high on its own, and it doesn't start hard, starts very easy. Again thanks

Ok I am new to the site, had a long member friend tell me I had to join cuz I could find help here. So I have a 1998. 5 24valve with about 430,000+ miles. Starting around the beginning of winter I had a slight small skip, nothing major barely even noticeable, as winter went on and we are now...