i pulled out my plugs after about 500 miles just to check them and bc it was running bad. the plugs are dark black with alot of carbon on them. so its running a lil rich how can i adjust that. also would a madz28 tune help.

would sea foam be a good idea?

 

try replacing the o2 sensors. if they are fouled up, then they will tell the computer to run rich. sea foam probably wouldnt help at all with this, if anything, it would foul up the 02 sensors some more. A tune might help, but unless your running a cam or other major mods, then you dont need it. If the car is mostly stock, then there is something that isnt right and needs to be fixed.

check for exaust leaks too, those will cause the car to run rich

 

thanks any one know where i can get o2s for a 94z for cheap

 

www.gmpartsdirect.com

or do a search for jason cromer, he works at a chevy dealership and can get parts really cheap