help gas mileage
 

ok heres the deal i have an 87 gt that i recently put on heads and intake and took out the ac and emissions stuff and now im getting really bad gasmileage like 5 or 6 before the mods i would get like 12 witch wasn't great but i could live with o and i have my fuel pressure set at 45 but iv tried setting it and 39 but it did not help and the car is still speed density and i gave it a full tune up in june any help or ides on what to look for would be a big help