Unichip LX470 - Starting issues

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Thunder Downunder

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Hi all

Have been pulling my hair out trying to figure this out. The obvious answer is yes (based on the title) im having starting issues when the unichip is plugged in. It is a fuel problem but cant understand why? i have to pump the pedal like crazy on cold starts to eventually get it to fire up. Once engine has been started it is totally fine.

Leads me to believe the fuel rail pressure or something drains back once the car cools down and not enough is getting to the injectors at cranking. Im no expert here just trying to figure out why. And lastly why is it so common hearing starting issues with the unichip? Unichip cant even give me an answer at this point...
 
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