Got Shell 93 Octane and now barely idles 1973 Dart 340
I can get close to just shy of 15" but seems to be a different reading every time I cannot it. Idle seems to a little rough shaking a little more than before all this: console and door panels rattle. It will only start warm if I hold the accelerate part way. Timing set to just above top mark of the timing marks.
What just started is a hissing that appears to be coming from brake power booster, which was not happening before I disconnected the manifold line to the check valve and plug the manifold connection and the hissing goes away, but a hard brake pedal. The brake pedal seems very low. Check braking linings are good. Fluid a tad low maybe 1/2" in rear reservoir of the master cylinder. No leaking at the wheel cylinders and front brake hoses were changed recently.
I can get close to just shy of 15" but seems to be a different reading every time I cannot it. Idle seems to a little rough shaking a little more than before all this: console and door panels rattle. It will only start warm if I hold the accelerate part way. Timing set to just above top mark of the timing marks.
What just started is a hissing that appears to be coming from brake power booster, which was not happening before I disconnected the manifold line to the check valve and plug the manifold connection and the hissing goes away, but a hard brake pedal. The brake pedal seems very low. Check braking linings are good. Fluid a tad low maybe 1/2" in rear reservoir of the master cylinder. No leaking at the wheel cylinders and front brake hoses were changed recently.