ok I have a iroc with a 350 TPI in it. Well when I race someone right before it shifts at like 4 grand or 4500 it feels like some stuff is vibrating. It feels weird and I shouldnt be feeling this. Whats going on?

 

Unfortunately that's a very very very vague question and we'll need a lot more information before we can narrow it down. It could be fuel starvation, or, a hell of a lot of other things.

Does it vibrate in neutral? Does it vibrate at high speeds, or only high rpm's? is the car stock?

------------------
89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

 

It doesnt do it as bad in neutral but still I can feel it. Like today it as raining and I for some reason tried to pass someone and lost traction and my rpms shot way up. just felt like my engine was gonna blow or something. But it was only at 4500. My car is mostly stock except exuast and intake stuff. I never tried it at high speeds.
Also another question like if I run my car hard I smell like a burning smell?