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.[/align]

 

Maybe a tuneup?

 

I forgot to mention that I replaced plugs and ignition wires last week and smoged it. Someone asked me if I disconected the battery before I did it and said that if I didn't, that computer may still think it's running on old parts (I think it's bs but I did it anyway) so the check engine light is off now. With that said, before I smoged it the light was on for a long time and when I scaned it, it showed bad cat and misfire in cyl.3 but it ran fine and I thought that the misfire was caused by old plugs and wires (I had a misfire in one of the cylinders years ago and you could really tell, I replaced the coil and it was fine). Anyway, I cleared the codes, replaced plugs, wires and air filter, passed smog and after 170 light came back on. Still ran fine. Now out of nowhere I have idle stall problem. Hope that make sense.