I just signed onto this website and I have a northstar powered monte carlo. I have a 95 seville 4.6l with modifications done to it. I know nothing about these engines or trannsmissions. I also did not know hwere to post this. Anyway when I drive only sometime I can not climb over 3500 rpm. Does any know what this is ???

sounds like something is wrong with the engine, thats as much as i can tell you

The only I know for sure right now is my radiator is cracked and I lose coolant like no other. I am going to replace my radiator so I can bring it to operating temperature so I can check this out.