Well the engine was running VERY strong before, even after puting the timing from 20degrees to 15degrees it still pulled like a b!tch. but now it lags i guess you can say. when im on the highway doing regular speeds, let off the gas, then put it back to where it was it backfires. get me if im wrong but that means there is eccess fuel in the pistons. it just started to happen. what could i all look at to see what it is? ill prolly end up buying a fuel pressure regulator and set it at who knows..something that looks good..any idea's?