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The IAC isnt the problem.
The computer calculates fuel based on temperatures, vac (map) and speed (rpms)
and later when in cloosed lopp takes the lambda value into the calculation.
The computer doesent have a clue wheter its rich or lean until it goes into cloosed loop.
Id check the fuel pressure, lambda and map sensor first.
Have you read the plugs? ( so you dont have a leaky injector)
 
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