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So I just changed the ecu 2 months ago, since I changed it I've been getting this problem; when i start the engine, the car does not respond to the gas right away, I have to wait for around 5 seconds so the engine revs up. I feel like it is a calibration issue, but I haven't found a way to calibrate the throttle body, can anyone help?
 

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Sounds like you need to clean your throttle body. Over time the throttle position at idle slowly opens as gunk builds up around the plate. When the ECU is reset (replaced) the throttle position defaults to stock and won't idle correctly.
 

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Clean both the throttle body and the MAF sensor.

IMPORTANT NOTE Do NOT use carb cleaner to clean either component. There is specific cleaner for each for cleaning. Carb cleaner will remove important coatings from the TB and MAF.
 
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