hi guys my 93 sts 116 k miles goes like stink but i have noticed when i cane it it makes a rotten egg smell. i have already cleaned the throttle body and replaced the air filter and pcv. car runs great though. i love this car i have only had it a few weeks already considering purcasing another. but we are caddy guys in my family the 93 is the 4th caddy in my family. i am going to learn the northstar inside out motor swaps ,the whole 9. what do you guys think makes the smell? i am leaning to the o2 sensors are they 4 wire sensors or the 1 wires?