85 300SD 231,000 - bought with 180,000 in Oct 2005 - used for communting from Tennessee to Maryland and back a few times each month. Just useless FYI!! Problem is.. at low speeds taking off, it can hardly get out of it's own way especially with A/C - was going to give this to my son when he gets his license but i'm a little worried it is too slow and he'll have no power to get out of trouble if he pulls out in front of someone. i hooked up a pressure gauge between the switchover valve and the line to the ALDA. when taking off i get 1-3 psi until about 2500 rpm when the pressure starts climbing. at about 3000 rpm i'm getting 7.5 psi. is this right?
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