Stuck 500 miles from home. Misfire Cyl 6. Help!

[Mike1261]

2006 E53, 3.0i

3 weeks ago we had a particularly hot day in Florida, and on a 150 mile drive I suddenly lost power when Cyl 6 shut off. Managed to stumble home with many restarts of the engine.

Replaced the Coil on 6 and didn't have any further issues.

Now we are in Macon GA and it's another particularly hot day with 500 miles of continuous driving under our belt. Cyl 6 is misfiring again. Worse than before. Can't even limp around this time.

There's an auto parts store around the corner, so I'm thinking of buying some tools and pulling the spark plug to see how it looks.

The car has been running beautifully otherwise. It seems to be related to the extremely hot (97+ degree) weather and extended use of the vehicle.

Can anyone think of anything to suggest before I haul this hunk of junk to the shop and pay through the nose to diagnose this?