MY LS 400 won't start. It will rotate all day long but will not start. It has new ignition wires and spark plugs, and has new distributor caps androtors. The coils were testedand found to be in working condition. Is there anything that I am missing here? I don't know what else to look at so I'm turnng to my fellow LS owners for a little help. One thing to note, just before I changd out the wires and plugs, I had lightblue smoke puffing from the tail pipe. After the wire switch, the car never said a word again. I tried putting the old wiresback on but, the car still said nothing. I don't know what else to do.