Don't buy the coil. Buy one sleeve, coil stop, spring washer, and left plunger/link/crank assembly.

If the plastic coil sleeve won't come out of the old coil, go ahead and get a new coil, but usually new coils aren't needed.

PS: I would get a rebuild kit for both flippers and do them at the same time.

Stop. Don't go out and buy all that just yet.

Check to make sure the wiring to the coil lugs is good and nothing is loose. Make sure the eos switch is working properly as well and that the gap is right, as well as the wiring to the eos.

Also, is the flipper shaft tight? If it's loose, it'll make the flipper seem weak.

Yeah, I assumed the game was "as-is" condition and was in need of a rebuild (like most).