Engine starts choking and misfires then starts to jerk violently
hello, im new to this kinda stuff and i need to find some answers bout my problem. i have a good general knowledge of how engines work and how to fix em but this is just getting on my nerves! i have a 97 for ranger 4 cylinder 5spd manual. and it starts fine; but when i start driving either right away or when i get on the highway it chokes and starts to backfire like hell. then i try to give it gas and it starts to jerk really hard. so far ive put fresh plugs and wires and new coil packs. fresh tranny fluid and oil. cant find any leaks in the vacumms. new fuel filter and i use gas treatment on every fill up. any help would be appreciated.