Anyone know what would be causing violent jerking in first and second gears? I got a salvage title 98 hx I picked up and have done about every maintenence item and repair I can think of, and it drove fantastic for the last couple weeks, but last night on my commute I downshift like normal and it started. This morning tested it out and this is what I'm getting:

Smooth idle
Jerks almost immediately in 1st
Smooth in 2nd until you apply enough gas for accelerating, then the same jerking
Rest of the gears run fine

Thought about it being gas but filter is new, tank of fuel is new from a Chevron with a bottle of Redline SI-1, and higher gears work fine so probably not the pump?

Any thoughts appreciated

My maintenence included: plugs, wires, cap, rotor, fuel filter, multiple oil changes, valve cover gasket, pads & rotors, brake flush & bleed, cv axles, transmission flush, clutch, clutch bleed, coilovers to replace bad shocks