spares I cook at 3-1-1
baby backs at 2-1-1
I find 2 hours in the foil turns them into mush. I adjust that last number based on how close to done they are when I take them out of the foil. I've ended up ranging from 3-1- 2 to 3-1- 15min
If I don't foil I cook a little hotter 250- 275