I have three of the dle30's and both of the ones running did the won't idle low and quit when tilted thing. Every time I pulled the idle back to land right when the plane stopped so would the engine. It turns out that even though the engines ran like a great in every other way the needles still were not right. The engines quit when tilted because for some reason when you idle it down or tilt the plane the mix richens up. From where they ran and sounded great I leaned out the low needle almost a 1/2 turn and richened up the big end almost the same amount. Now they are so lean at idle that it take a minute or so of warm up before they will throttle up without bogging. These engines now run even stronger. I speculate at this point that the needle lever it the carb is not quite in the right spot. When I get a chance I will probably adjust the lever up a couple of thousands.