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A worn O2 sensor can cause this problem too--the reason for this is that the ecu will set fuel trims based on what the O2 sensor reports as stoichiometric during closed loop operation. If the reported value is in error, all of the ecu's fuel maps will reflect that error, which may make the afr's marginal under some conditions.
No doubt the intake and exhaust mods have also affected the volumetric efficiency of the engine which requires compensation as well.
Hope this helps.
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