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Dash removal is not in order. It's at the very least hard to see. You have to do the job by feel. Unclip the cable from the throttle, fully seat the cable in the housing to give the cable maximum free play at the throttle pedal end. Reach to the top of the throttle pedal arm and make sure there is some cable beyond the plastic clip. It may help if you have a bit of free play in the throttle pedal to lift the throttle pedal to get a bit more of the cable extended out. Once the ball on the end of the cable is well free of the clip, rotate the clip so the open part of the clip meets the open part of the throttle arm (on the top) and slip the cable out of the assembly. If your throttle arm doesn't have an open part (depends upon year), the just remove the clip and slide the clip free of the cable.
Just getting frustrated and pulling the left side of the dash out would have only made it worse.
Wound up taking out the driver seat - very easy to do - and laying on my back to reach up in there. Just couldn't put my hand on it in any other position.
I ordered another clip - it was only $7. How much my chiropractor will cost after this is another matter ....