Ahhh.... I am still punishing myself on my '88 Cherokee. It is running now, but MPG is a dismal 6 MPG. I know there is a cracked header that I need replaced, but I also was inspecting the vacuum line going from the MAP to the Intake Manifold, and right where the elbow meets the bigger plug at the Intake Manifold, it cracked and broke off as I touched it. I tried fixing it, but I am going to have to redo it as I think it is still leaking a little. As the piece kind of fell apart, I ended up replacing a lot of it with soft vacuum line, unlike the OEM hard vacuum line. I am wondering if the hard vs soft type vacuum lines makes a difference, and if I have to remake more of the piece, if I should just get a replacement from the dealership ($), or if I should fab something myself, and if so, if I should take mind of all the internal diameters of the vacuum lines. Or whatever I should know about remaking vacuum lines
Thanks emission experts and physics majors!