OK, so i feel like my car has been burning wayyy to much gas... also, when i put the heat on, it stinks of gas. Also occasionaly the exhaust will make a gargle sound, like a misfire for like 2 seconds... What wrong with my car!!!

Could it simply be just a faulty 02?... No codes, cause i have diablo shut it off...

Please Help

 

im having the same problem. lol. i had the diablo tune in my car and got 12 mpg but when i took it off i am getting 15...still sucks. i dont use heat...in florida. lol