Just checked the timing on my 4Runner. Weird thing. The idle was a little high (not much.. need to clean the butterfly think) and when I jumpered the diag box there was no drop in idle speed/retard in timing. I brought the idle down (butterfly close by hand) and then the jumper worked. I have never noticed this before with any of the numerous 22res I have had. Could the TPS be not functioning properly. PS. I have been trying to figur out why the engine performance is feeling somewhat sluggish. Anyone experience this?

Hi Roger, thanks for the reply.
My question is that IF my idle is a little high, will the tps (or something else) cause the non-response of the timing jumper?
Background scenario: The throttle plate has been hanging up ever so slightly when it gets very cold and it was hanging when I first tried the jumper...no jumper response... Nudged the throttle plate down by hand and viola! the jumper worked.
So...is the slightly 'high idle/jumper no work' normal function? ie. does any sensor or tps pick up the fact that the idle is high and disable the ability to retard w/the diag jumper?