Whats all needed for good gas mileage? These years seem to be the worst for fuel emissions stuff added to the engine. I have a 84 Chevy truck c-10 with a 350/350 STOCK set up and this thing has about 30-40 vacuum lines laid over the top of the engine a couple thermal switches, diverter valves ,etc,etc, but the computer is also not hooked up. Is all this stuff needed for good emissions/fuel economy? At this time I have the egr,and charcoal canister hooked up and nothing else. All this stuff is not needed per the state law its not required to meet newer vehicle emissions and is not even tested with the smog machine any more but if it helps save gas and keep air clean at the same time I'll hook it all back up. Will replacing all this stuff be a waste of time and money or will it help?