NEED HELP! breaks up under boost!
 

i just bought a 89 mk3 turbo stock except for hks turbo back....
problem is that when i get into boost it breaks up ,miss fires...vacume leak?

any suggestions ? thanx!

my 1j did that for a while, how's your intercooler? Also, you should think about checking your timing and make sure your using at least 91 at the pump. I don't think a vacuum leak would cause that.

Let's try to keep all the discussion for this problem in ONE thread.

http://www.toyota-supra.info/forums/...der-boost.html