Does it stick wide open? Is the throttle return spring binding? Something is binding up.I sincerely doubt it's a clutch issue.My T-MAXX 3.3 did this,it wound up being a bad signal due to dead batteries.Are you running a fail safe? If the clutch bell spins by hand,it's not broken clutch springs.I been doing this with r/c for yrs,since the 1st nitro came out.Feel free to write me with any other questions.