what does this code mean, i've found a number of things online about this code, but how to narrow it down, I have a 98 pontiac grand am, about half the time i start the car it will idle high and then low. i'll give it gas and most of the time it will quit doing that. It never has troubles while driving the car only during starts. But the main problem is sometimes it will stall after starting and then won't restart. I would love someone to tell me some way to narrow down the problem. People have told me the pcv valve, egr valve, plug wires, direct injection nozzles, ignition control. I don't know which to do first and i don't want to replace all this and then finally fix it. thanks