Ok so awhile back I had purchased a used upsolute 630cc ECU from someone on vortex. When the ECU is plugged in the car starts and idles but there is no throttle response and the EPC light comes on. My question is coud this me a immobolizer issue not letting me get throttle response or is the EPC light a whole different issue?

 

Does the Part Number on ECU exactly match yours....all the way down to the last letter??? You can't swap non-matching ECUs between cars.