P0170 on 1997 Mitsubishi Eclipse GSX

keep getting this engine code. it showed 2 codes p0170 and p0125 (ect)sensor. replace ect sensor and still comes up dont know what the problem is

Here is some info, I bet you have a thermostat that is stuck open.
It may be related to this code too, not sure.
P0170 Fuel Trim Malfunction (Bank #1)