A few buddies and I have these, they are great trainers, seeing how I am new at this. We have had some crashes and have re-built them. I had a problem like that and found that I had a pinched fuel line. Another buddy discovered a problem in his fuel tank, one of the hard lines was bent up. Just a few things to check. Problem with mine was I took off anyway and couldn't full power, kinda landed on a store roof, rolled off the flat roof and hit the ground, thank god I had my flaps down.....Good luck.