Flush the shifter with spray solvent, use the straw & get it into as many spots as possible. Do this several times while working the shifter. It should start to catch. Let the solvent dry & relube. For the solvent I've had great luck with White Lightning Cean Streak. Anything that won't eat plastic and leaves little residue should work. Relube with Tri-flow, T-9 etc. something lite, no wet lube or heavier oil. This is a pretty common problem & usually can be fixed as described. Good luck.