Hesitation only under WOT?

[showaski]

So just recently, I've noticed something with the compact that is very, very odd. It runs perfectly fine in all conditions except for WOT. For instance, I can give it 50% - 75% throttle and it will pull just as if it were pulling under WOT, but if I give it 100% throttle, it starts breaking up and hesitating as it reaches higher into the RPM range.

I did some research, and many people blame the TPS or an o2 sensor for this. I was wondering if anyone on here has experienced something like this.

I should probably add that this hasn't happened in the past. Previously, I have been able to give it 100% throttle without it hesitating or losing power at all.

[xxxJohnBoyxxx]

I assume no CEL is on. I would start with fuel filter and if that doesn't fix it then check fuel pump flow at regulated pressure. My buddy had the same issue and kept driving the car until it wouldn't run anymore. Replaced the fuel pump and now the car runs the best it has since he owned it.

You need around 42psi at idle and WOT maybe 48psi since the regulator is vacuum controlled.

Another problem could be the Cat converter is clogged and not allowing the motor to exhale the exhaust