If the car is running and driving fine now minus the steering issues then you may be ok and not chipped a piston. Most likely when the multiple misfires started the ECM pulled power to keep it from going boom.

Sounds like you could use a new set of plugs and wires, fuel filter, clean the MAF. Then see how it runs. Although w/o a way to actively scan it for KR you're asking for a new motor if you run it that hard again.