good answers to those questions needed...
also turn the car over with glow plug removed and turn the car upside down to expell the built up fuel...it will pool by the crank and could cause damage to crank and/or piston arm..and wont necessarily expell the majority of the extra fuel but only what on top of the pistion..... Gravity and all that.

also have you adjusted ANY of the carb screws yet???

answer these questions honestly and we ll be able to give more direct advice...

things to check, even with new plugs, i check them wiht the glow igniter B4 i install. be sure it glows a fairly bright orange...also insure your plug is fully charged, a mildly weak glow igniter will not heat the plug enought to start the engine. thus the Bright Orange, and not just heating up a bit......!!!!!!

DO NOT LEAVE YOUR NITRO FUEL in direct sunlight. it will start to break down the lubricants in the fuel and will start to cause all sorts of issues. Store in a cool dry DARK area, the more cosistant the temps the better, it can last forever if done this way and is TIGHTLY sealed in the jugs......... i had a gal of fuel (about 1/10th left is more like it) that was left in sun, didnt know it.. truck started to run like POOP. after 3 days of resetting/adjusting/ect. with no luck... i opened a new can of Traxxas fuel and after retuning all is decent again..
what is the % of the fuel too 20% nitro with 18% lubs ect....?
airleaks shouldnt STOP it from running unless they are HUGE then they will be VERY OBVIOUS, but if small then the engine should start/run but will run lean due to the air ingestion.

get us answers to these and we ll get you squared up strait away.

GL
HTH
Tim