Originally Posted by BoostnBenz

I would say it is pretty safe to rule vacuum out of the equation, I've drove around before with my modulator line completely off. It only caused abrupt shifting. If you had bent accelerator linkage it'd be making the car go faster or slower for the same pedal angle, not really dealing with the shift point just where your foot is. I'd say it is very likely the bowden cable is your issue.

You are correct it would be in second waiting to shift into third as third doesn't get into those RPMs until upper 60s. Remember hash marks on cluster.