Cold starting a problem

I meant to tell you that no codes are present except the one for ECM memory reset. The previous owner told me he had the computer replaced.I have replaced the ECT sensor because it wasnt quite showing the right resistance for the temp.

It could be a number of things but first i'd check condition of spark plugs, rotor asnd dist cap, wires also if that checks out then you need to gert in to the sensers and do some checking, coolant temp senser for one (not temp gauge sending unit) also check mass air flow valve some have a temp senser in it to measure air temp, idle air control valve could be problem as well check cranking voltage also and amperage draw on starter could be cause as well starter could be robbing voltage from igniton system so engine will not start. Hope some of these ides help some