a cylinder will still run on 95psi in a cylinder.had a nitrous b16 the rings were on their way out and had about 80-70psi in each cylinder lol. the best way to check spark is to physically check and see with your eyes. pull the ignition wires one by one place a spark plug in the spark plug in the ignition wire. hold the spark plug to a ground (a bolt on the rad support) use insulated plyers so u dont get shocked too lol. if you dont have any spark try swapping your main relay.