Machine is bump feeding the wire

Presumably the wire feed motor is running and driving the wire feed roller?

If this is correct there are a few things to check - when welding it isn't unusual for the wire to become welded to the tip. When this happens a powerful wire feed tends to keep feeding until the wire becomes impossibly tangled and knotted. Low powered wire feed units usually just begin to slip on the wire especially when 0.8 mm or larger wire is being used.

Try removing the welding tip and check if clean new wire will feed smoothly; ensure the correct roller groove is being used for the size of wire.

A welder that is used infrequently often becomes troublesome for a while. Micro-rust forms on the outer layers of wire and some of it is removed as it travels through the torch liner, sometime the liner becomes damaged and should be replaced.

Removing the tip and wire and blowing trough both ends with compressed air should remove any accumulation of dirt and dust. Cut off and discard the outer layers of wire if they have become dull. I spray a little WD-40 on the wire to keep rust at bay and help the wire feed through the liner. Ensure the wire end is neat and straight and with the torch laid straight along the floor allow fresh, clean wire to feed through the liner.

Once a few inches of wire is protruding fit a new tip of the correct size, fit the gas shroud and you are good to go.
If the burn-back rate is adjustable on your machine it should be turned to minimum.

Various things can cause the wire to weld to the tip apart from the burn-back rate - dirty or corroded substrate, holding the welding torch too close to the work, incorrect adjustment of the power/current and wire speed and welding continuously so the tip becomes overheated and if gas is being used, a gas pressure/volume that is too low or perhaps attempting to weld in a draught...

Welding with CO2 gas produces a coarser operation with more spatter and suit some machines more than others. Some machines perform better and more consistently with Argoshield, a mix of CO2 and either 5% or 10% Argon. The added expense might be worth paying.

Means thread is way too loose. Up tension dial number until the thread just skims the surface of the fabric.

the obvious, yet sometimes overlooked problem is to check if the wire feeder rollers.do you have the proper tension set?(did you do the wire test when you shot the wire to see if it bends or stops)

Potentially, I would tighten tension on the feed wheels slightly first and see if this improves it. Also blow out the cabinet on a periodic basis as debris can also build up in the knurlings of the feed wheels. If it does not, pull out the liner and check it for kinks or other damage.

Depending on how old you machine is, its possible that the wire feed rollers are worn causing the wire to slip in the grooves. Replacing the WFRs may solve the problem. Test this by watching the feed rollers as you pull the torch trigger, place a gloved hand over the nozzle as the wire comes out and watch to see if the rollers slip on the wire when the wire meets the resistance of the glove. If it does that likely the problem. Hope this solves the problem.

have you tried adjusting the tension on the flux wire? before you start feeding the wire into it make sure there isnt any kinks in the wire. seems like it doesnt take much for it to bind up once you get start welding with it im sure you will run into this problem quite allot. usually its from welding the wire to the tip. i have to be honest it can ve a pain in the ***

Inside your machine just in front of the wire spool is an adjustment to increase the tension on the wire tighten it a little bit at a time until your wire feeds

The wheel does not spin because its not making contact with the wire.
Try adjusting the tension screw.

I'm having a problem with the wire feed on my Lincoln Pro Mig 140. The wire feed speed is not consistant. It seems to be slipping even though the tension is tight. Any solutions?

I have the same welder. Worked well for 15 years until the drive bearing stopped spinning. I cleaned and oiled the bearing and it has been working like a coon on the farm since. Nice 120 volt welder....