Maxus pro-140 feed motor feels like it pulses

Your description suggests the wires to the torch trigger have shorted during the liner replacement.

I would think your best answer would come from a medical professional. Why not call a doctor?

See your doctor now!

Your blood pressure is high. Please get it checked ASAP even if you have to go to the emergency room.

carbs clean and checked the fuel pump diaphrams not gone hard etc ?? tank and fuel clean and fuel getting to carbs ?? pulse pipes on intake manifold to pump clear and if you crank engine you feel a pulse of air ? plugs sparking ? i would fit a fuel primer bulb inline of feed to carbs and prime fuel and see if helps and as engine running see if priming keeps it running then i would check pump !!

the speed feed rheostat(control) is shorted or you've got a short on the board if it has one. Hopefully just your switch. Check for a short from the switch to the drive motor. Remember, electricity can and will kill you. Be safe
Bryan

Probably the bridge rectifier. I had a 120 and thats what happened to it...

Give the whole welder a good cleaning and then look for a short to ground.