off the line problems

[jamie 6.5t]

right guys and girls i have a madrat with a fusiion 6.5t motor in it and as soon as i pull of ov the line for some reason it never fails to wheelie its almost like it wants to as were i hate it when it does due to sometimes crashing and ive also tried slowly putting on the power still wheelies any help or advise on how to stop it would be more than welcome thanks