so when i let my truck sit at idle it has a little murmer in the idle every few second. can't make it go away by just playing with the timing. so then when i get the truck into high rpms it starts to smell like unburned fuel. what could this be. i have a new distributor, wires, plugs and i think a coil but i can't remember. i have the factory aisin carb on it that i recently rebuilt.