Now that I solved the first problem of no spark, now it backfires under a load only. I have set the timimg to 5 deg btc and checked the fireing order about 10 times and all is right. Pluges are gaped to .045. I have never had this much troubld from just a tune up before, this is making me want to sell this thing., btw I just bought it two days ago. let me say that before i did the tune up it ran fine. Now that I have changed the plugs, wires, coil and rotor it runs like sh1t. I know that incorrect timimg is what causes backfiring but I have it set to 5 so come on it should not be backfiring.?.