[Lithorian]

my 95 deville pulls 22 in vacum at idle, i would start with your distributor seeing as you have p012 - no distributor signal and p053 - distributor signal interupt, change the pick up coil, search for a vacuum hose at the back of the motor near the driver's side corner, that damn hose ALWASY gets knocked off while doing the rear plugs, that will cause your low vacuum and is hard to get starting fluid in, as for the ISC you need to calibrate it or it wont work right, with the engine running, lift the throttle off the plunger and push the ISC in till it bottoms out, disconnect the ISC and adjust the plunger so that the gap between it and the throttle is .060, if i am correct, of course ranger will correct me if i am wrong:P, as for the knock under load it's PROBABLY spark knock, try rodding out the two EGR tubes in the throttle body. I had most of these problems with my deville as well, except for the distributor codes, so i have a few more tricks up my sleeve if this doesnt work. p023 - EST signal problem