weeknrodder

I have a '92 z28 5.7 that has the following mods to the engine. Engine bored .030 over, 10:1 pistons, heads milled with .202/.160 3 angle valve job. assembly balanced, lt4 hot cam, 1.6rr, msd 6al box, adjustable fuel reg. 3 pulley kit. Engine running rich and hesitation when trottle off idle. Does the ECM need reprogrammed chip? Any suggestions?

vettedoctor

in one word yes. you need a tune for the car to run correctly at this point the hot cam is going to make the car more efficeint