AM0608
Member
I just got my expedition back from getting the master cylinder and brake booster replaced. Now when I start it up it idles rough and then stalls soon after. If I give it a little gas to keep it from stalling, after a few mins it will bounce from 500 rpms to 1100 rpms every few seconds. If I put it in drive it will idle at 500 rpms but drive fine. The check engine light doesn't come on at all and I hooked up my scanner and there are no codes. Anyone know what this could be? The mechanic said it could be the Mass sensor but I think it sounds more like a vacuum leak since there is no CEL on.
