Running Problem

[jonesin]

Hi there. Have a problem and hope that someone knows what the answer is off the top of their head. My next move involves a tow truck!! Anyways, the 2.3 in my 87 Mustang starts but does not respond to throttle inputs - takes a few seconds after holding down pedal before it starts to rev up. Vacuum is all goofy too - real low and erratic at idle (around 5in HG) to zero at higher rpms. Checked all kinds of things - exhaust plugged (no), bad EGR (no), compression (good), fule punp runs.... Replaced fuel filter, cap, rotor, plugs, and wires. Still nothing. Any ideas? Greg