rattles at low rpm

Rattles are not usually caused by electronics unless it's preignition (pinging). Get it checked out ASAP, it could be an oil delivery problem and could damage your engine. If you want to find a specialist, here's a directory link for you: https://repairpal.com/cadillac-repair-in-naples-florida

i think its a vvt problem thats controled by the computer so i think it would be a good thing to try first if it dosent work im going to put a new motor in it shure dose run great thoe