IM NOT SURE WHERE TO START.

I TURN THE VEHICLE OVER IT STARTS WITH NO PROBLEM. ONCE WARMED UP IT RUNS VERY SMOOTH IN PARK. IF I PUT IT IN DRIVE IT RUNS SPARATIC SMOOTH THEN ROUGH THEN SMOOTH AGAIN ALMOST LIKE A SURGE. IT ALSO DOES THE SAME IN REVERSE. WHEN I GIVE IT GAS IT STALLS AND WHEN I RESTART IT IT STARTS RIGHT BACK UP AND SAME PROCESS AGAIN, ENDING IN A STALL. ON ANOTHER NOTE THE REPAIRS I HAVE CONDUCTED IS: NEW REMANUFACTURED BENCH FLOW ADJUSTED CARBURATOR, WITH ALL NEW PARTS INSIDE. IT WAS FLOW TESTED PRIOR TO PUTTING ON. NEW MAP SENSOR, NEW PCV VALVE, NEW FUEL FILTER, NEW CAP ROTOR AND WIRES PLUGS, NEW EXHAUST, NEW AIR FILTER, I HAVE RUN BG FUEL SYSTEM CLEANER THROUGH IT ALSO. IT IS LOW ON FUEL AT THE MOMENT AND SITS ON A HILL WITH FRONT END POINTED DOWNHILL. BUT IT STARTS BACK UP WITH NO HESITATION DESPITE BEING LOW. RAN A CODE DIAGNOSTIC FIXED ALL CODES, COMPUTER GIVES POSITIVE FEEDBACK THAT IT IS ONLINE EVERYTIME. BUT NO NEW CODES HAVE BEEN GIVEN SINCE REPAIRS WERE DONE. NT SURE IF THIS IS A TIMING ISSUE, IGNITION, OR FUEL. PLEASE HELP THIS IS VERY IRRITATING. THE CAR RUNS EXTREMELY SMOOTH IN PARK WITH NOT EVEN A VIBRATION AND OFF AND ON WITHOUT VIBRATION WHEN IN DRIVE OR REVERSE. THIS VEHICLE HAS VERY GOOD POTENTIAL WHEN IT RUNS CORRECTLY. THANK YOU