Honestly...I doubt the thing was actually ever tuned all the way. I would pull the chip and send it to ADC to check it and maybe give you a base tune.
I would also do a compression test...what is the oil pressure? Does it have a gauge? Then check all the sensors that may have to do with the CEL.
Maybe the boost control on their was to help the BOV not open under light load...that's what mine would do. Then the car would buck like crazy b/c it would just let a bunch of unmetered air in and out. I just put washers in their.
PM if you need any info...I had lots of bugs in my custom set-up, but I fixed them all. I would be willing to help.
FYI I am in UT too...I guess us UT guys build our own set-ups.
