96 chevy lumina problems?

[carcrazyfool14062]

it runs and drives fine when it is cold but when its warm it idles with a little hesitation but when you drive it the hesitation become much worse there is no coolant ring on the oil cap and ofter driving it the smell of rotten eggs gets worse.

 

[REV B]

Rotten egg smell is an indication of a worn catalytic converter.

 

[Harley Drive]

mixture is wrong probably a faulty temperature sender or mass air flow meter