MARKED MAN
Active LVC Member
Hello all, got a small issue with the Mark surging. This past week end I did some upgrades to my intake and fuel system. I added a 255 intank fuel pump, 21lb injectors, and a new reproduction cobra gt40 upper and lower intake manifold. Everything bolted up nicely and the car made a 90 min trip after all of the work was done without breakin down on me. The only problem I am now experiencing is the engine surges while at idle and acts like it wants to stall. I'm guessing its a vacum like somewhere as I now don't have the EGR plate anymore. On the stock EGR there where two vaccum lines; one on each side of the plate just behind the throttle body. On the new intake manifold these lines are eliminated so I just blocked off the lines and sat them aside. This is the only thig I can think of that would be the obvious but I would think ford would of thought of this and came up with a solution. I noticed a couple of guys have this same intake and was wondering if anyone could reccomend any lines I should check to try and solve this problem.