The motor idles perfect and runs like a top but when I took it out for the road test yesterday it sounded like a VW bug. There is a good bit of hesitation under load. It revs fine and sounds good when it's not in gear.
I took the old (1) wire o2 sensor out to see what it looked like, it was black so I installed the (4) wire Universal version that came with my LC Header. It didn't seem to help. I may check the Cat to make sure it's not clogged but it seems that would show a problem at idle as well.
I checked the plugs/ plug wires and the front 2 were clean. The back 2 has just a tad bit of black soot on them but not on the ceramic part.
I rechecked the Timing and it is dead on.
If you have any ideas of what this might be please let me know.
