Hey guys, sorry if this has been hashed a thousand times, but I couldn't find my exact problem. I am having a transition issue, please help.

MDS .40
11-5 / 10-6 Master Airscrew The problem happens with either prop.
10% fuel - Synthetic/Castor
Hanger 9 Performance Glow Plug
A little over a gallon of fuel through it.

The engine will start usually with one flip. At idle the engine will run forever either super slow or a slightly higher idle. Pinch test at idle (which I have to hold for a couple of seconds) will increase the idle speed and then kill the engine. A straight transition to full throttle is quick. At full throttle the engine is very strong and will run indefinitely. A very quick pinch will gain 300 to 500 rpm.

Ok, now for the problem. It doesn’t matter if I am flying it or on the ground, if I go to half throttle for a couple of seconds then increase to full the engine almost starts to 4 stroke. If I do a pinch test at that time, it will increase and run no problem. If I run at half throttle, then back off to idle for a second or two then go to full, no problem. But, I can not go to half, then to full; the engine will almost die.

Any ideas? Please help.

mb