Low end backfire and slow acceleration

SOURCE: Major Hesitation and backfiring

You most likely have a bad fuel pickup or a bad changeover switch if its dual tanks. Also like I have said before, one of the most common reasons for any fuel issue with this year is the fuel and wire connections on top of the tank that lead to every major part of your fuel system. No one wants to drop the tank or reach up and disconnect the switch to check. So I get these trucks for close to nothing from people like you and run them forever, after I spend a day replacing the needed wiring or pickup. to remove anything you must drop the tank or take a chance of breaking something. If you are uncomfortable doing this. I may be able to give detailed instructions. [email protected]

SOURCE: 95 Mustang gt backfiring and RPM's bouncing

sounds like you have jumped a tooth on the timing if not timing out

SOURCE: what would cause a ford 302 to back fire out of

possibly timing or number 8 exhaust valve not seating correctly. Do a compression test on no.8 to check valve seating.

SOURCE: 2002 ford ranger 4 cyl exhaust backfires after

check Oxygen sensor and associated wires. if you have access to a scan tool watch the sensor signal. it should resemble a smooth wave at idle with engine warm, if its anything else you need a new sensor.

SOURCE: motor backfires when you slow down to go around

Your main problem could be anything from Timimg out by 2mm
problem with hole in exhaust system ,,or a gasket blown on the intake.
To much fuel getting in the engine and as you throttle back the extra fuel in the chambers fire without a spark.. with the heat of pistons
The way to check the exhaust is get someone to listen to the engine in park and you put on a glove and put your hand over the tail pipe and if the engine stops and cannot hear a whistle under the bonnet then the exhaust is ok
Let me know how you get on ASAP Ron