evolution4.7

Hey everyone I have a little bit of a problem and would be great if u guys could give me some tips. I have a genuine evo 1 with some minor mods. Running a t70 turbo. I have 2 intake pipes. One is the stock rubber pipe which I don't like at all. Other is a aluminum pipe. Car just loves the aluminum pipe but every time I come to a stop it stalls. Very annoying in traffic! It does not do this with the stock intake pipe. Any one have any ideas on wat it could be? I've checked pipe for leaks and it's sweet!