I have been trying to fix this problem for a while now and cant seem to find a solution. Originally, I had noticed that my car would only rev to 6500rpm and then it would just stop there. Today, I was playing with it again, and the first two revs went up to 6500, but after that it reved normally up to the redline. Could this be the secondaries not engauging or would it be caused by something else?

 

my car did this and its when i have less than a 1/4 tank. make sure your fuel pump has full voltage, sock on the fuel pump is clean, check fuel pressure by Ting in with a gauge, and FILL THE TANK

 

if im correct sounds like a TPS problem...
TwEaK