Went to fly my new plane today with my engine that only has 2 flights and 4 breakin runs on it. The engine a .40 ASP always ran good but after a min of low idle it would develope a little hesitation. There are 2 adjusting screws , high and low. The low is in the throttle barrel behind the prop. Real fun to get to with the engine running. Anyway after repeatedly trying to adjust the idle its still not working right. Today the engine would idle until I remove the glow igniter then it dies after a second. No signs of rough idle or anything and at high rpm it runs fine. Its only the 6th time Ive run this engine. I start with the adjusting screw 1 1/2 turns out and make very small 1/8 turns and wait a few seconds for the change. It will sound just right till I remove the igniter then after a second it suddenly just quits. Tried 1/8th turns up to a total of 1/2 turn both ways but no difference. If I open the throttle about 1/2 way it will run with glow igniter off. The engine was running fine first 10 min till I tried to tweak the idle ( dumb me ) I did the original adjustments without this problem though. Im wondering if its just a bad glowplug. Im useing a fox, long, with idlebar.