It's a 1999 Mitsubushi Galant, 4 cyl. She drove it to work today and it stalled at light. She was able to start it again but hat to keep it at about 1200 rpm. I got there to pick her up and it was doing the same thing when it was cold too. I drove it home and it stopped doing it. The car would idle at 1000-1100 rpm (little high) and then started to die again. I took out the MAF sensor and sprayed some brake cleaner into it as well as pcv valve. Now it seems to run like it used to, idle around 600 rpm but I'd like to know what the problem may be. Any help greatly appriciated, thanks.