Dropdagloves20

So I was driving my notch tonight and just started driving it as it had been sitting for a while. The car has been driving and pulling great for the last 2 days, but tonight for some reason after about 2 hours of cruising(with stops of course in between) it started limiting the rev to 4000RPM. I checked the Throttle and it wasn't stuck or anything it's just no matter what I did it wouldn't go past 4k and when it gets to 4k it starts backfiring at times. The motor doesn't sound hurt, there's no knocking, it's not over heating, Oil's fine, it just acts like it has a rev limiter at 4k, but it doesn't. Any Ideas? Thanks!

lx5.0

it could be the module on your dist

MonsterSN-95

Do you run a MSD box or any after market ignition?