Mustang starts bucking after warmed up at 2000 rpms

[SEB]

Car runs great while its cool. But once it warms up it starts bucking & studdering like its detonating. But runs like a raped ape before it warms up

[Snatch Napkin]

Probably o2 sensors. Pull codes to be sure.

This '87 I'm messing with is the exact opposite. It will hesitate down low while rolling into the throttle. Once it's at WOT it clears up. This only happens before it gets fully warmed up.

[Mark Preus]

On my Porsche it did that and it was the o2 sensor

[crapstang]

+1 on 02s