Success finally! Bringing this topic back to life again, I am pleased to let everybody know that I think I finally have the right setting on my plane, and sorted out the idle problem. My last 7 or so flights have had no engine failures. Here's what I did. Well, I listened to the guy at my local hobby shop who told be that my problems were in that I was always fiddling with the mixture, and I should just leave it. Well, I haven't touched it in the last 5 flights and my engine hasn't quit yet. And about the idle, I figured that it was idling too slow, so I increased the idle with just some trim and it won't quit on idle anymore. Although, my plane still tends to come in hot sometimes so the idle could be slower to allow for the slower speed, but then the engine would just quit. I'm happy where it is now. Thanks everybody for your help and I hope that the engine failures will be much less now. I enjoy flying so much more now that I know that my engine won't be always on the verge of dying all the time. You should have seen me last night. I couldn't put my plane down.

But I shouldn't say that I haven't had an engine failure in those last 7 flights because my last one for the night last night, quit but it was not any mixture or engine problems so that was a very big relief to me. I had a hard landing nose down that stopped the engine because the prop hit the ground. Every time I have a nose down impact, I discovered that the clunk in the fuel tank flips forward so that its stuck in a U shaped position facing the front of the tank. It was fine when the tank was still full with fuel, but when the fuel got low after 16 minuets of flying mostly at full throttle, the engine sounded at times like it was going to die because there were big variances in RPM because the fuel would swish back and forth in the tank causing, because of the position of the clunk, when the fuel would be away from the clunk, it wouldn't be getting any fuel so that's when the RPM dropped and then it would rebound again when the fuel would move forward towards the clunk. So when the tank got real low, that's when no fuel went into the clunk and the engine quit. Luckily I was right by my field so no damage there. I'm glad it was something I could se rather than an actual engine malfunction. Is there a way to prevent this from happening, or should I just check the tank every time the nose strikes the ground to make sure the clunk hasn't flipped forward?