I think it is more of an emissions device, probably prevents a little HC going out the pipe every time you shift gears. I've not had any smog check folks look at mine, so if your engine otherwise works fine, leave it off. I find mine helps a bit with it's internal spring to help push the throttle open which is tricky with the early 22RE throttle linkage:
- http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml#Dashpot

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
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