If the car has a BOV instead of the factory bypass setup (aka BPV) then that may be the problem by itself. The AEM can be tuned to account for this. This is only a possible issue if you're running the stock KVAFM or a MAF. Speed/density (MAP) setups are generally not susceptible. There's not a lot of help which can be offered if the car is heavily modded unless you begin posting exhaustive details about the build, ECU tune, diagnostic and runtime logs and so on.
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