2013 GMC Acadia SLT 2WD SUV

Black 2012 GMC Acadia SLT 2WD SUV. It features a 3.5L V6 engine. The emission test is ready and the check engine light is on because it starts but cut off after a while. Will start back but need timing chain it was sold to me like this unknowingly. Paid 2700 asking for 2500 obo