Thank you very much everyone for your input and most valued feedback - just like to update this in case someone else runs into a similar issue (although it still seems odd and boggles me), the dealer said there is a seal sensor attached to the VVEL module which somehow came loose and over time water/moisture got in and shorted the ECU along with the VVEL module.
Total cost for repairs was $3k for the ECU and VVEL module. I'm just happy she's back to her normal form and running again now.
Although it is strange that the original owner, my brother never had any issues until I parked it for 2 weeks after taking ownership and plugged it into the ctek battery tender all the issues came up.
Unfortunately I'm traveling overseas for business and did not have time for getting a second opinion..
She's running now, thank you everyone again
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