hello guys,

its been two years since I have touched my r/c cars and finally broke them out this past weekend and had a blast. I have:
RS4 3 rtr
RS4 3 SS
Tmaxx .15

Well the next day I went to the hobby shop and bought my first buggy the ultra lx comp by OFna.

Well my problems are after 5 tanks of fuel is that I can seem to keep the engine running. After a few minutes of running it will die. The most runtime I might have had is half a tank of gas before cutting off. I kept the needle at 3 turns and then tried to tune it to 2 1/2 to 2 but still did not make much of a difference. What is the problem with these engines? Are they harder to tune? Or am I doing something wrong?

thanks in advance.