My Jeep Cherokee jerks back every once in a while when speeding up or hitting the gas.

Will not recognize and will not do the backup secondary startup using key fob on the ignition

A lot of time my jeep won't start normally. I have to boost the battery for it to start. The battery is brand new. The alternator and starter have been checked. I use a power pack to jump start it but… 

Ogni tanto si accende spia motore e segnala controllare cambio automatico, diagnosi calo pressione,e a volte a marcia lunga.

Se puso duro el volante y me aparece en el tablero que hay problema con la dirección asistida y el control electrónico de estabilidad, ya revise todos los fusibles, limpie el conector de la dirección…