Try taking out the plug, cleaning it and the brass o-ring off really good, and tirghtening it down pretyt tight with a socket.

I had the same problem when I first got my evader. Turned out my glow plug wasnt sealing up good, after I took it out and cleaned the threads and that o-ring, then tightened it up really tight, it started working fine.

Also it sounds like the car is running rich, try leaning out the high speed needle valve some.

If this car is brand new and the engine hasnt been brokin in, thats why its not reving up to full rpm. Youll need to properly finish the breakin procedure per teh manufacturers instruction BEFORE fine tuning the valves.

One more thing, I dont know what kind of glow plug heater your using, but if its one of the dry cell operated (the kind that takes a non rechargable c or d cell), then youll probobly have a hard time getitng the car started as those kind of heaters dont get the plug any where near as hot as a rechargable igniter will.