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Hello, you don't show any codes but the SES light is on all of the time?
That sounds like a loose valve cover harness under the valve cover. It would cause the SES to be on but not always show up on the scan tool with codes. This is because the IDM is the item seeing the codes. Once this engine gets a couple of cylinders misfiring it will see to have almost no power at all.
The easiest way would be to perform an injector self test if your scan tool can perform this function. If not you can unplug one side harness at a time when its running rough. The side that doesn't change very much is going to be the side the issue is on.
If you wiggle each harness while plugged in you might be able to make it run rough also.
Do you have photos of the oil? There is nothing special you need to do besides reassemble and make sure the connectors are fully seated.
With the vehicle is running will any codes show?
It could be a fuel pressure concern if you found water. It could just be a bad tank of fuel that had a lot of water in it as well.
I'm sorry but I will opt out and see if any other expert has any ideas. At this point I would be using a scan tool to test the IDM to see if it is bad
If you have a good working IDM I would swap it over and see if it makes a difference.
yes the IDM off of the 97 will work to test on the 99
If you want to try it and let me know.
did you test the passenger side connector at the valve cover yet?
I've seen an IDm work in one vehicle but not another for some odd reason
So it is the passenger side that is bad?
Its running better but still has a slight miss. If that is the case if could be from an injector that has failed.
no damage will occur with swapping the IDMs
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