The mileage on the car is only 104,000, which I believe to be original. The injectors were just rebuilt by Sean Watts with Monark nozzles. I haven't done a compression test but haven't had any reason to suspect low compression--I would expect symptoms once the car is warmed up, which there are not. There seem to be many ways for a bad glow plug to hide itself and if things don't figure themselves out I might pull them all again sometime in the future. As for the battery, I had it tested a couple months ago and it was fine, but I'll bring it by autozone to be tested.

No one suspects a bad ground somewhere or a faulty relay?