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I have a 16 stage 3 cam m7 666 to the wheels. I was getting on it and when i would get close to redline it would stutter then go away and again close to redline same thing. Next day I ripped it at the light and then SERVICE rear axle light came on. Started back up and came back on. Im thinking i need to change the spark plugs. Any ideas? and if spark plugs should i do coil packs as well? if so what spark plugs should i go with and coils?
Check the small gauge ground wire at the battery. It needs a really clean connection. Many symptoms from that wire. Service rear axle is top of the list.
Need to log, keep close eye on fuel pressure. Good chance its running low at top rpm, have seen that a few times, especially if no upgrades with mods you have done.