My friend's Tower 75 engine is deadsticking a lot. It seems that if he gives it the throttle fast, it hits the glow plug with a rich slug of fuel and quits. It will idle beautifully and the top end is slightly rich of top rpm. So what gives.... any ideas? The engine is upright and different glow plugs have been tried to no avail. Fuel is 10% Omega type I believe.

Thanks!

Ernie