What did I screw up?
 

I was checking the air filter the other day to see what the condition was, looked good so I put it back in. About 3 hrs later the CEL came on, shortly after that I noticed alot of bucking and hesitation... and it's getting worse, it will barely idle and its died 3 times. The CEL is reading as a MAS problem, low voltage I think. I checked for loose wires or if I unplugged something--nothing that I can see. Any Ideas, I doubt the MAS is so sensative it will die after having a filter change.

RE: What did I screw up?
 

nothing, not even a guess?

RE: What did I screw up?
 

did you remove the mass air by any chance while cheking the filter

RE: What did I screw up?
 

did you loosen any pipes/unplug the maf and switch the ignition on, ensure all pipes are tight

RE: What did I screw up?
 

old post but,with the car running tap on your purge valve,it sits on the air housing,it'll tell ya right then if it's bad,same happened with mine.