[mlambrecht82]

Lugging an engine is one of the worst things you can do, these SOHC modular 4.6s like to rev, I have a hard time keeping my car at high rpms, cause I think that I'm hurting it, but it is actually better for the car. When you lug your car, the timing gets out of wack, and the PCM is trying to get up into higher rpms by dumping tons of fuel in, try to keep your car above 2000 rpms when driving around town. Closer to 3000 if you can. If you still have a problem, then I will have to think about it a little more, but I think that it is just your driving habits.