I have a 89 5.0. Mods are: aluminum heads, rockers, headers, 75MM TB, Fuel pressure regulator, 190 lphr fuel pump, hypertech chip, 373 gears. My question is my care runs great under normal conditions but when I really get on it and put it to the floor it feels like a sputtering or no power at about 4000 RPM. I notice this a little in 3rd gear but it is really bad in 4th gear. If I let up on the throttle say 3/4 throttle I actually will have more power then if it is all the way to the floor. Also when it bogs down like this I notice white/blue smoke coming out the exhaust and can smell that it is burning oil. I initially thought it was a lack of fuel problem so I added the bigger fuel pump and changed the filter. This did not help. Engine is not pinging but I decided to try to set my timing from 14 and to about 10 and that did not help. I had put in new plugs and wires when I put my heads on so they are pretty new. This is a new problem that just started so it is not from the new head install. I also checked my head gasket and that is not the problem. Please Help!!!