Ok, so I put a 5.4 DOHC into a '03 mach 1. Engine is rebuilt with a cobra jet intake. (with MMR plates). Car run strong with tons of torque. The only problem is that when its at idle, if I take off fast or even just pump the gas, the engine stalls. This car has been professionally tuned by premier. (very reputable dyno shop here in utah). They said it might not be getting enough air at idle, which sound opposite to me. But I'm out of ideas. I'm so close guys, please help!