RB20 shut down problem.

[sleepingGTR]

So this just started acting up, when turn my key ignition off my car won't turn off, it sputters then it will finally shut off, and at the same time it wont start, so is there a sensor or some deal goin on that you can help me with thanks.

[Otis Performance]

i know someone that had the same problem

you need to put some good spark plugs and 91 gas or higher in your car..