2001 Grand Caravan, Sport Edition, 3.3

My engine light came on and I replaced the Ignition Coil. Came on again and I replaced plugs and wires. Engine light is off, but car still runs rough and hesitant. Can you HELP?

Vichle low in water do I start engine before adding water

The return line leaks

The leak is coming fromxthe hide of the line.
Is there a valve core inside like the low side of the unit

Prior to the problem the car started to lose power or reacted slower when trying to pass speedup

It did that before and I changed the intake manifold gasket and the map sensor and it stopped for a week but is now doing the same thing over again

Shifting gears, picks up speed and then drops speed

It picks up speed and then it drops speed, when driving