When starting to accelerate car hesitates big time until you reach 30 mph. After that , it accelerates as normal . Doesnt matter if car is warm or cold , car hesitates even worse when load is on motor , A/C is on , or climbing a hill .

I've heard it may be an oxygen sensor ? Dirty injectors (have cleaned twice with Tecron - no luck ) , or cap & rotor ??

Any further ideas as how to proceed in diagnosis ?

Thanks