What are you referring to when you say a "trunk pop spring?"
I swear I just replied about this not to long ago.
If you're wondering why the trunk doesn't go up when you release it, that's how it's supposed to be.
My 1981 Cadillac Coupe Deville was like this too... you pop the trunk and you had to physically go pull up on the trunk. Same way with hatchbacks and wagons...
If you didn't mean that, then disregard!
Unless you mean this:
Trunk Spring #
I don't remember my SVT or my GL having this... maybe I just didn't notice it!
Ok, searched some more, apparantly it's a
mod that pops the trunk open...
Well,
doesn't pop it open all the way, but at least enough so it unlatches.