not much help, but popping through the exhaust typically means its going rich on decel. popping through the intake a lot of times is due to a lean condition. most efi systems spike lean when you snap the throttle closed, and then compensate. I'd guess you need to pull a little fuel out in the closed throttle position?
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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