I have a 2008 G8 procharged running a 3 bar mafless tune. At idle, I can't get over 19.6% TP. Tried lots of things with no luck. Only became a problem after losing the maf. While cranking, it will open up to 25% but will quickly come down to 19.6 which is causing me some idle issues. Just wondering what I've overlooked. Thanks!