I'm all for saving fuel//leaves more money for hot rod parts. The surging was caused by the grey/black wire being disconnected to check the engine timing(EST). once I reconnected it, it ran fine. But it made it awfully hard to check the timing with it bobbing up and down. I drove the truck to work today, ran great, but halfway here I got a check eng light, So I'll have to hook up the scanner again and see what's up.