Purge valve?

What is your question?

I have no check engine light. My fuel pressure holds when I checked with gauge. My car jerks when accelerating from a stop aThe purge flow monitor on obd min and value, the value is higher then the min, I have champion spark plugs, not AcDelco, and new coil pack and a new mass air flow sensor, but the car shivers with light shake like a generator or something from engine department when it's in park shiver is 80% less noticeable.