My SC wants to (buck is the best word I can come up with) once 5 lbs of boost is reached. I have tried sea foam, fresher gas, and a new coil pack with little or no change. It runs great at idol with -20 lbs and all the way up to +5 lbs. The same is true while driving down the road, until it goes over the five lbs boost mark. It does have a under drive pulley and a DI, however I am not sure how much that would affect the trouble I am having. Does anyone have any ideas? It is a 93 with 5 speed. Thank you in advance.