lack

I know everything points toward a clogged catalytic converter but Meineke says it's ok. '89 2.9 auto w/overdrive and posi-traction. 75k on bottom end. 10k on top end. <30k on tranny. 150k on most other peripherals. Compression is around 110 (to spec). New wires, plugs, cap, rotor. New EEC. New...

I have I 99 B4000 M/T, flowmaster muffler, magnaflow cat, K&N FIPK II intake. My engine is lacking power throughout the rev range but is most notable on the highway. I have trouble maintaining 65 if there is even the slightest hill, which usually requires downshifting and putting it to the...