I took my 87 supra out today and it wouldnt go past 4000 rpm. It would get around 4 grand and it the front end woould fall to the road like the rev limiter kicked in but if i have my foot on the cluch she would go up in the rpm's like it was nothing wrong with it but as soon as i let off the cluch and try to drive it, it wouldnt go past 4 grand can any1 tell me what the problem is