A buddy has a '91 si thats been converted to obd1 with a z6 in it. It was running fine after the conversion now about 2 weeks later on throttle in the low rpm's it will sputter a bit and also higher rpm and somewhat then on easing the throttle you can smell this horrible rotton egg??? I am stumped..
Has anyone had this and found a cure? Could it possibly be a bad charcol canister?
Any help appreciated..

 

Rotten egg smell is usually a clogged cat.

 

Thanks, he mentioned that he thought that his ebay muffler was going...thats probably clogged aswell.

 

Also check the IACV screen for carbon build up, that usually accounts for 80 percent of idle problems.