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Hello, hoping someone can help. I have a 94.5 that I have owned for many years. It has a TS6 chip and stage 1 absolute diesel injectors. Both have been flawless for years. Recently the check engine light will come on, it starts running rough, and it will just barely rev when pushing the accelerator. This happens randomly. Usually it will start back, but not always. I replaced the cps but that didn’t help. Can’t pull any codes either. I’m at a loss on where to start.
 

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I would physically remove the chip and see if the problem stays the same or not. Also, check all you valvecover harness connectors for evidence of melting or burning. Remove the oil cap and sniff to see if it smells like burned wiring insulation. Check for oil in the ICP connection. Cheers!
 
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