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I have recently replaced ICP, IPR, valve cover wire harness and fuel bowl harness and I am running a TS 6 position chip in my 1997 OBS 7.3 and my hottest tune turns my truck completely off even while in motion etc and throws a check engine light. I forgot the code I scanned awhile ago but do I need a new IDM?
 

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Welcome to TheDieselStop.

Unless you know what the code was, there's no way to tell if your problem is the IDM or something else. If i had to guess, I'd suspect the TS chip. Remove it completely, run another scan and see what you get. Otherwise, you're just throwing more parts ($$$) at it.
 
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