would putting a cc305 cam in my 94z28 cause my car to misfire and i need to get programming? would an intake manifold leak cause misfire? it also has surging idle right now. (took off emissions stuff too- blocked remaining holes from vacuum tubes and t.b. tubes not used)

 

are you getting a good spark to each of your cylinders?

 

i just put that cam into my 94.........had bad misfire untill tunning, then had just a little missfire after tune, ended up being plugs tho (even tho they were brand new), if u need tunning try www.fasterproms.com Jeremy is local and does a killer job....good luck