yz 426 throttle shaft sticking at tps

2002 YZ 426 stock everything except for auto decompression exhaust cam from hot cams

I completely rebuilt my carb and am know experiencing the throttle sticking. The problem does not appears to be with the spring, throttle tube or cable. The trottle shaft seats into the TPS and when it does the throttle shaft then becomes sticky, it still moves but the spring does not cause the throttle to snap back. The throttle can be easily be reduced by hand however as it is just sticky, not stuck. If I pull the throttle shaft out a little, from from the TPS boot, the throttle snaps back as it should.

Any ideas?

Is there a particular type of lube that should be used inside the TPS where the throttle shaft seats, if any?

Thanks.

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