You are boosting 42 PSI?? What turbo do you have . . . HX35??
I just had a few codes pop up on mine (234, 238) for overboost on my 99, after injector install so I threw a boost fooler on to keep the CEL off and outta limp mode. But anyways . . . are you running an oiled air filter?? Also look on Ebay I saw one the other day for 25 dollars . . . and they give all the part numbers (Mopar and Cummins) too.