Dont stress about it man.... catastrophic failures dont exist on well maintained vehicles. Hell you could've got a bad tank of gas...

If there arent any codes, just keep your eye on it and see if there are any changes. If a sensors going bad, it'll let ya know soon enough. If its the MAP sensor you'll probably get a rich or lean DTC from the o2 long before it dies on ya.

What plugs did you put in it?