V8EATR

I have a LS2 GTO making 441/419 with a 231/235 (.617/.621 112+4), PS LT's, UDP, catless x, vararam, ported LS2 intake. I'm getting some idle issues with the cam and the vararam. I'm thinking its time for a better MAF and maybe a Fast intake. Do you guys think this will be worth the cost? I use hptuners to tune and can make the car idle fine 80% of the time but it still acts up no matter what I do and its got to be a combination of reversion and the vararam. Any thoughts on what I would gain (power and or better idle)?