Long story short. My car stalls every once in a while at a stop light while in drive with the brakes on. Not always, but most times after it is really warmed up. If I go to neutral it usually wont stall. A while back I had to pass emmissions (which I had failed twice in CT). The mechanic said my timing was set ahead so he moved it back to stock. I then passed. I asked him to move it back ahead and he said he had. Well, I am not sure he did. Also, I have tried making sure I have 93 octane plus a octane booster, but still the same. Cleaned the air fiter also. Any ideas what this might be? Thanks. John