First off, did you check for codes in the ECU?
Second, good luck. Finding an S5 TII ECU, much less a 'chipped' one is gonna cost you, if you can even find one!!
Check out an Rtek, maybe they can help you.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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