I am throwing code 0702 (rich mixture). 07 Exige S with 2bular cat eliminator and 24" muffler, CEL eliminator. Symptoms are high idle at stoplights, gradually slowing to about 1100 rpm. Also some "popping" on hard acceleration, as one would suspect with an overly rich mixture. Car only has 5000 miles, including one track day. No other engine mods. Any ideas?