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Thank you, I will and see what it does once it has something past the headers.

OK, I could not run it by creating the MAF fault. However, I have replaced the MAF sensor, and the engine will idle roughly. I put the original tune back in the ECM, so I now have faults for both...

So, I was able to make the changes you suggested, and it did start and idle for about 5 seconds. I was feeling optimistic, and then it stalled. It smelled flooded and would not restart after it...

So that I understand completely. To fail the MAF i would calibrate the Airflow vs Freq by setting 0 in the first box and something like 12 in the rest of the HZ range?

Thank you for the advice mister480v. I found that I had the can pinned wrong at the TCM and was able to get everything working. I now have a new issue. The engine is hard to start and will not idle...

I have an L96 paired with a 6L90 from a 2014 Express van. They both came from the same unit, along with the E38 ECM. The data bus is unstable and disconnects when using VCM Scanner but will not load...