It will start and run for a little while

1987 Honda CRX HF carburetor stock. Starts sometimes and misses. Compression check good, new O2 sensor, timing belt, water pump and idler by shop. Runs rougher with vacuum line connected to air filter housing. Sometimes dies and will not start. Have owned car for two years. Ran flawlessly until recently. When running, drips fuel into two barrels of carb. Plugs show normal wear and no signs of water in oil. Smells very rich when running. Had to pull to get running after getting stranded. Smoked during shifting all way home--about three miles.