Check engine light flashed and then stayed on

I just bought a 2005 Rx-8. The guy I bought it from stored it in his garage for the winter so it probably hadn't been driven in a while. Due to some recall, the engine was replaced in 2012 and he'd only put 4,000 miles on it since then (I verified this with the dealership). Anyway, as I was getting on the freeway, I decided to rev the engine to redline (I let the engine heat up before). When the rpm hit 7,000 the check engine light flashed once. Now, I can't remember if it stayed on before or after I pumped gas but it's still on now. Also the cooant light goes on and off intermittently but the coolant level is fine. The fact that the check engine light flashed like that makes me think it's a loss of compression issue.. but on a brand new engine?