Ok here is the deal... I just picked up an 89 Formula 350. Sweet car aside from the fact that everytime I punch it I hear a grinding sound and the car chokes at 4K rpm's. I'm a beginner at this and would like to know what the problem could be before I have it repaired. Now, everything works great just up untill it reaches 4K. What could the problem be? Tranny? Drive shaft? Fly wheel? I need help in a major way.