Fuel Smell Inside Car

First off I'd like to say I'm a bit of a newbie at this so go easy on me. :D I've had my 01 GT for 8 months now and until today I've had no problems with it. Today, however, on three different occasions I got a real heavy fuel smell inside the car following heavy acceleration in 2nd gear. The car also stalled once on me when I was coming to a stop. The only difference between today and yesterday is that last night I removed the air silencer after reading about it on here. Could my problems be linked to the removal of the silencer, and should I even be concerned about the smell? Thanks in advance for any advice you all can give me. Mike
 
My car used to stall when under heavy braking (not the best time to lose power) but it stopped doing it after a month or so after the first time... really weird but it just went away :shrug: As for the gas smell, I can't help ya there, do you have any mods or a possible exhaust leak?
 
Well, I'm an idiot. I should have figured it out when I mentioned "fuel smell". SES light came on tonight and the first thing I thought was to check the gas cap. (Girlfriend was so kind to fill it up for me yesterday):D Low and behold, it was just sitting inside the fuel door, unscrewed. I guess my next question is how long will it take for the SES light to go off? Thanks for the help. Mike