Found good info of 20v ITB in the following link.
http://clubroadster.net/vb_forum/showthread.php?t=39898" onclick="window.open(this.href);return false;
Toyota AE101/AE111 4A-GE Miata ITB Resources
Toyota AE101/AE111 4A-GE Miata ITB Resources
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Re: Toyota AE101/AE111 4A-GE Miata ITB Resources
this is some good info