Well I just experienced my first in flight failure tonight. I was flying with my instructor on my last flight before my instrument checkride. We were in IMC at night, en route to a fix to do some holding. Approaching the fix the DG failed. I flew using the standby instruments while my CFI did some troubleshooting. He rebooted the G1000 and did some mucking about with the circuit breakers but it didn't fix it. About 10 minutes later, the DG came back for a few minutes, and then it was off and on throughout the rest of the flight. Now I know this was really no big deal, but it wasn't too comforting logging my first actual night IMC and seeing a giant red X appear in front of me. It was pretty good partial panel practice though! (Actually, we were planning on doing partial panel work anyways, so it worked out nicely.)
Then while getting vectored for an approach, our pitot-static instruments started acting up. Nothing major, but occasionally they were behaving erratically. We turned on alt. static for a few minutes and switched it back and that problem seemed to correct itself.
One more problem made things interesting this evening. Shooting a GPS approach, I reduced throttle to descend and we felt the engine sputter. Immediately I put the throttle back to where it was and the engine went back to normal. I was hesitant to further reduce power, but my CFI assured me that it was okay. Anyways, we shot the approach, went missed at LPV minimums, and started our climb back outbound for the next approach. As we were climbing the engine started running rough. Then we felt/heard the sputter again and we decided to call it quits. My CFI took the flight controls, pulled a quick 180 and kept a high approach just in case. We landed and that aircraft is going straight to maintenance in the morning.
I know that my little experience tonight is really no big deal, especially compared to what I'm sure some of you guys have been through. Share any stories about failures, rough running engines etc..