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I have a 90 and decided to convert to the 91- style basically for the ease of getting replacement parts. The 90's have a different ISC but use the same plug. The TPS uses a different plug and also mounts differently than the 90 style because the throttle shaft is also different. I sent my TB to throttlebodys.com for the rebuild and had it bored out at the same time. I am very satisfied with their service and price. As far as rebuilding it yourself, it can be done. I have rebuilt one before. It really isnt to bad. Really the only modification you can do to the TB other than boring is to block of the FIAV, which TBs.com can do for you as well.
Here is a pic of mine after I got it back from throttlebodys.com
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Brent
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