This may sound a little obvious, but i justpurchased 4caldera 10E's and2 of them did the same thing. Turned out that the throtle trim was set all the way up So now I ALWAYS check the trim before I everturn on a new truck. I hope this helps. I have never had any problem with Redcat serviceor URCHobby,(where I buy EVERYTHING from), those guys are top notch.