installed a kenne bell on a 87 speed density. Car falls on its face as soon as you accelerate, it may pull hard for a second then go right back on its face. I installed the vacumn lines like the KB instructions said ( i think, have been know to make a mistake), installed the assembled hose with the orfice/check valve to the MAP sensor. Kit also came with a FMU which i installed. There are 3 vacumn ports on the KB manifold, 2 large, 1 small. I have 1 large to the PCV valve, 1 large to vacumn tree, and the small one to the fuel pressure regulator. Discharge manifold had 1 fitting/2 plugs in itand i have it ran over to the FMU, After i saw how the car ran, i installed a boost gauge into 1 of the empty ports on the discharge manifold side of the KB to see what was going on. Do i have a vacumn line wrong somewhere? could it be a faulty check valve? I have the check valve hose assembly installed with a T in the fuel pressure vacumn line, a T in the boost line to the FMU, I have the diagram KB sent if i need to try to post it. Thanks for any help