Having Issues With My EFI Tunes Now Switching To MM3

[Madmanjay55]

Hello, yesterday I installed an EFI Live Autocal, and now my truck isn’t running right.

My question is, when I installed it erased my stock tune.

Once I get an MM3, do I need to uninstall the EFI, or will the MM3 override it?

Would I have to do anything other than plugging it in?

Any help would be very appreciated.

Thanks.

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[Corkey]

So with EFI live to an MM3, let whoever know what tuner you currently have.

Going from EFI live to MM3, the mm3 won't be able to read the stock file on the truck.

In most cases, when going to EFI live, they will format a somewhat stock file but not a true file of which the MM3 will read.

I made this mistake, but it was very, very quickly resolved within 20 minutes.

You will notice a huge difference in the swap.

I hope this helps, and yes, the MM3 will override EFI.

I won't get into detail as I've said what you could expect.

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