hey i just bought the condor pro buggy and im breaking it in.

I just had to replace the pull cord so i got the electronic starter, but now and when i had the pull cord, it idles very high, sounds like it is going to blow up, and it wont move at all, the gears are spinning very fast in idle but go faster when i push the gas, but car doesnt move.. What is the problem,
should i tighten the flywheel , lower the idle(how) i dont know what to do please help!!