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I appreciate the response but the 2010 is the 4.6 motor still, not the coyote

I tried to search and found confusing information on this topic. I know that the later ECM are not able to disable PATS in HP Tuners, but does anyone know if you can successfully disable PATS on a...

I'm wondering if there is a mechanical issue as well... It does seem to pull decent vacuum numbers, but the evap line is hooked up to the vehicles existing system. I think I'll cap that off...

Fuel pressure is regulated by the in-tank pump in the vehicle. It is set at ~53psi

That helps, one less variable to track down, thank you!

I'll try that next. Just baffled how far off the tune was with/without MAF plugged in (rich without the MAF crazy lean with it plugged in)

I unplugged the MAF as a quick check to see if it helped the idle as with it initially plugged in the car would barely run, stumbled, misfires, etc. Unplugged it, the idle shot up to nearly 2k......

No sir, no cam. Motor is completely stock other than the fuel rail being run as returnless and a different MAF

I've tried to read until my eyes are bleeding, but it seems the more I do the more I confuse myself. A little background, helping a disabled friend complete a project he started years ago and is now...