Sputtering and bogging down when accelerating

This is a Crown Victoria LTD with a 302 engine.
Sometimes it accelerates decently, but not as strong as it used to, other times it sputters and slowly starts to accelerate, then occasionally it nearly stalls out barely a crawl sputtering and backfiring. I release the gas and press until it finally catches. It also cranks a bit slow. New starter, distributor, cap, rotor button, wires, plugs, water pump, and cold air intake. Redid the exhaust system and put a new fuel filter on a few months back. Bought this as my first car eleven years ago with 60,000 miles on it. Odometer stopped at 64,130 around a year later, so it has over 100,000 miles on it. Did not drive it for maybe two years between being stationed in the northern states and deployed to Kuwait and have not driven it but occasionally on the weekends the last few years. I have also replaced the EGR, IAC, and MAF sensor. I have been noticing skipping and stuttering when slowing down to around twenty then attempting to accelerate. It is hit or miss when coming to a complete stop. No issue when going downhill, but definitely still there when going uphill or not coming to a complete stop.