[kobrabytes]

Thanks Rick, that was what I was thinking.

I bought a dual sync from FAST, I like the setup and am not sequential. I put the FAST into alpha N, slowly working to get the tables rebuilt. Getting the MAP sensor out completely got rid of the backfire.

Do you have any samples of the base fuel, A/F, and spark tables for your setup? I want to see how the 3D graphs compare to the speed density.

Making progress!

len