ok here goes as I am driving down the road the truck will suddenly jerk but will keep on going down the road ..smooth as silk.... and heres one the check engine light comes on about at 2,300 rpms in 2nd gear but doesn't come on if the truck is just ideling but motors running smooth as silk I'm thinking iol pressure prob? please help thanks joseph

 

I would check for a loose connection at the injector harness.