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Originally Posted by FerociousP
afr swings at cruise are most likely attributed to the ecu falling in and out of closed loop... or not even reaching closed loop... and that could be to a variety of reasons.
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I've driven this car and there doesn't even seem to be anything wrong. Honestly, there were no complaints about how it drove before he installed the wideband, but now that there are numbers that change, there must be an issue. My honest opinion is that this is more a case of observation bais than anything else. But what is being observed is most likely what you're referring to. In cruise I see 14.5-16 afr and under light to moderate acceleration it dips down to 12's and 13's....nothing special there.
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I don't think you are looking in the right place to fix your problem. These ecus were designed to work in a stock capacity with stock components... Its very easy to make a change that the ecu cannot compensate for, or even knows about. Yes these are old ecus with old technology, but the technology worked for many years before people started modifying them.
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The Rtek 2.1 has the capacity to adjust fuel and timing so its certainly more flexible than the stock ecu....for example the ability to datalog. Rick take some logs and post them and point out exactly where the problem is occuring. Doing so will allow you/us to see what the TPS value, inj duty cycle, afr and other parameters are and allow us to do more than guess at what the problem is.
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Originally Posted by TitaniumTT
Whoops... forgot to mention what I thought the original issue was.... I'm voting TPS.
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quite possibly
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My ubber expensive hella reliable badass pump that I use in my own car is a stock supra TT pump 
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Hard to beat OEM for reliability. I got rid of my walbro (came installed on the car when I got it) and installed an FD pump because 1) it was loud as hell and 2) it caused the car (otherwise completely stock) to run rich, smoke on start up and occasionally not want to hot start.