1995 Toyota Corolla new coil bad?

My 1995 Toyota Corolla gave me problems with dieing and not starting. Sometimes it would work when cold and run fine until it warmed up. I found that the coil had a crack and burn spot on the top by the high tension pole. I swapped the coil with a new one and it now starts right up.

However, now it is bucking hard under acceleration, it idle's perfect and if I accelerate hard it does not buck, only under light to moderate acceleration

I took it for a 25 mile drive and other than the bucking it ran great. If I keep the rpm's up it does not buck.

With the old coil it ran fine cold and did not buck but would fail when warm. With the new coil it bucks even when cold.

It sure seems that maybe I got a defective coil. The computer has a code 71 which is EGR temp sensor but that has been on forever and I don't think it is related.

No doubt the bucking could be caused by several things but it seems odd that it started with the coil swap.

Oh and I changed the cap and wires with an old set I had with no change.

What are the odds I got a bad new coil?