I have an unfixable idle problem with my 1973 Maverick, 302 stock with Motorcraft 2100 carb, and I'm asking for suggestions. Because there was hesitation coming off idle, I had carburetor rebuilt last week by a specialty shop. Hesitation is totally gone after rebuild, but now it won’t idle smoothly. Once it warms up, it’s prone to run ragged and quit without warning, which is disconcerting in traffic. Runs great during acceleration and cruise above 1800 rpm. Runs ragged at small throttle openings, such as slow-speed cruise. Randomly shuts itself off at idle or deceleration (like the key was switched off), sometimes. Sometimes it will run rough before switching itself off, especially during light-throttle application. Other times, not. Same fuel pump, distributor, coil, points, cap, rotor and plugs as before carb rebuild, and all of those are less than 500 miles old. Fresh fuel filter. Fuel less that a week old. Idle mixture screws are 2-1/2 turns out. It runs least bad there. All under-hood rubber had been replaced and worked fine before the carb rebuild. Checked for vacuum leaks anyway by disconnecting everything from the vacuum tree and plugging the holes (made no difference). Both carburetor mounting gaskets (carb to spacer, spacer to manifold) changed with new Fel-Pro gaskets when carb replaced. Everything was squeaky clean and dry for assembly. Checked for vacuum leaks by spraying carburetor cleaner around the base of carb and egr while car idling (made no difference). Throttle linkage setup per for Ford factory service manual (not likely the transition slots are exposed at idle, checked that). Choke operating normally. Ground strap to breaker-plate is good. Battery and engine grounds good. Proper 7 volts to coil. Throttle solenoid works as designed. EGR valve working properly. I’m into this particular problem for about five hours of banging my head against the wall. Basically, I've gone through everything at least twice. In addition to my own efforts, I had a shop with vintage Ford experience work on it with no improvement. However, the mechanic did confirm points and timing were set to factory spec. They suggested swapping out components (such as a brand new carburetor). Any and all suggestions gladly accepted. After the car cools, I’m going to replace the coil with a known good one. After that, I am at the end of the road. Seriously thinking about how wonderful it would be to roll this hooptie off a cliff. Unfortunately, I'd have to hire a tow truck to get it there.