Cat clogged? I've been in a cat clogged vehicle before, accelerated slower than a school bus - literally had one pass us from a light lol (5.7L no less). If it was a clogged CAT, full throttle wouldn't help right and it would be an all over power loss not just at certain Speeds / Rpm's and throttle points. I am asking here, as I do not know but that seemed to make sense to me.