I have a 95 GT 5.0 of course, under hard accelration sometimes it will brake up at higher rpms and it always smells like it's running rich. After shes warm if I stop at a store or some were and shut her off them come back out and start it and leave it will run like a rocket for about 4th gear by that time what ever my problem is its warmed back up just enough to regain the topend brakeup. And on a load sometimes my valves chatter but not always, like when I leave some were after its already warm and I just started it back up when it is running like a rocket the valves don't make a noise. would you have any idea what it is. I have underdrive pullys, a K&N filter, headers, BBK offroad H Pipe, 40 series Flowmasters and a MSD cap and rotor and wires with autolight plugs. Can you help me please?