Engine cutting out around 4,000 RPMs, engine light intermittent?

In any gear the engine will cut out around 4,000 RPMs, as if someone unplugged it and plugged it back in, it happens anywhere between 3,500 and 4,100 RPMs and it feels like hitting the rev limiter, the engine light comes on about a second later, I also get an occasional engine light on startup that stays for a day or two then disappears (potentially unrelated).