ok i have a 350 in a 82 c10 has a 600 holley with a small cam and headers has brand new hei distributor new plugs, wires and fuel filter problem is most of the time i crank it up it runs like shit misses and hesitates dont idle all that great but then i can get in it the next day and crank it up and its a all out smooth running beast then get in it the day after and its back to running bad any ideas ?????