I have started tuning up my car. I did have a problem with it loading up and back firing. I changed the wires and now it seems like it back fires just a tad when i get out and run it HARD!!! But when it idles in park and drive it idles up and down???? I have checked all of the vaccum hoses! nothing? I have started taking off the upper intake. I have noticed a lot of black corroted stuff on the egr spacer? I am going to clean them all up and replace the gaskets! I would appreciate n e other advice!
Loping idle!????? 
