How is the oil level? Was there any noticeable smoke while it was running rough?
I'm thinking that a high-G stop like that may have slung all the sump oil forward starving the pickup slightly, perhaps starving the lifters, and possibly forcing a little extra oil on the 2-4-6 cylinder walls. That may have temporarily caused a bit of oil fouling on the front holes.
Just a WAG.
If all your hoses, electrical connectors, and the throttle body is securely mounted, it either starved for fuel on hard decel or slugged the cylinders with oil.