Not sure what your Fuel Injector Problems or Fix was?

If you had removed them? I would re-verify to see if the Fuel Injector O-rings are not pinched (Verify that the Injector turns freely).

Did you replaced the O-Rings for all the fuel injectors (3 per injector)?

Did you lube the O-rings with fuel before you installed them?

A cracked or torn O-ring will give you a symptom of lack of power.

I just had mine Flowed and tested. I have 160,000 miles on my motor and the Fuel Injector O-rings were dry rotted and baked on the injectors.

Your injectors might not have a good seal on them?

On my Chevy cavalier I had a clogged cat. It would start up fine and would run fine unless I try to give it to much gas at one time. Then it would stumble and hesitate. Replaced the cat and the problem went away.

I also find that this web site is very helpful when diagnosing problems.
CarPros