Car running rich Options

[NaderG]

I think my car is running a bit rich , the exhaust has alot of soot or carbon or whatever and when i start it in the morning there is a really heavy smell of gasoline coming out of the exhaust that only goes away after about 20 minutes of driving ... how do it tune the engine to fix this ?

[NaderG]

i know how to replace them , they are easy .... i just checked autozone and toyota world , Toyotas are 96$ each , auto zone has a whole bunch of them and they are all over 100 ..... so i should be paying around 200$ .... and i should expect a great increase in fuel millage , i am getting like 24 Mpg and i am not really an aggressive driver , i rarely rev the engine past 4k