Made EGR cover plate, completely eliminating EGR system. Found that I have vacuum leaks in every system, except climate control, bypassed all leaking systems for the time being. Have 15 at vacuum line going to tranny, at idle, drops to 0 as throttle is applied. Tested tranni fluid pressure at the modulator, and had 1 psi, after making a key adjusted pressure up to 42 psi. Still had hard/harsh shifts. Got back to shop and re-checked psi at tranni modulator. It was high, so checked vacuum going to tranni, it would not hold vacuum. So, then I replaced the tranni modulator, a real pain in the a$$. Had to replace tranni mount, so did the modulator at same time, still vary little room. Adjusted new modulator to about 38 psi, was shooting for 42 psi. 1st shift is still vary hard, other shifts are acceptable. For a smoother fisrt shift should I raise, or lower the psi, checked through the banjo fitting, by the modulator.