[Flieger]

I gave the 911 a good solo run on Sunday in the canyons. My dad was not feeling up to climbing into the car, even though I suggested he drive. The car ran strong on the 2 up and down laps I did but on the way back home it sounded "funny" like it was running on 5 cylinders. There were no unusual sounds before this, no cloud of smoke/fluid afterwards, and it seems smooth at idle but I can feel a bit more vibration in the midrange and it seems off song. Thinking it is ignition related as it doesn't appear/sound to be a leak between the header and head or broken headstud. Hoping it isn't one of those things or a broken valve spring. Going to try to pull plugs one at a time if it is still acting up next time. Hoping some new plugs or wires will solve it. Distributor cap and rotor look pretty good. It has been about a year since the plug change, but the car only gets driven every 2-4 weeks.