i had the gas line repaired and now it shacks, stalls and run really rough.

Engine performance concerns are always rooted in issues with one or more of the following systems: Fuel, Ignition, Air Intake, Exhaust. If you had an exhaust restriction, for example, the vehicle could lack power, buck and surge intermittently, and even stall. If you had a loss of ignition spark intermittently or consistently, same thing. It's important to do a good test for all the systems to see what is failing and then proceed from there with a diagnostic pin point test further.