I have an 86 Iroc-z lb9 engine that was running rich I replaced the throttle body with one from my buddies junk 86 T/A that made almost all of the codes go away I was getting a 33 after cleaning the contacts on the maf power and burn off relays the 33 went away now I have a 36. the engine ran better before I cleaned the contacts now it won't even stay running.Any Ideas? I bought this as a fun summer car while I finish my 81 T/A here it is almost july I haven't even driven the car.

 

I forgot to add my buddies T/A ran fine it was rotted to the ground