hard cold start popping hesitation

[mlozzi200478]

89 300ce,i replaced both fuel pumps per techs order of low fuel pressure,replaced fuel filter,i replaced the ovp,i also replaced the eha with a used one,the car still needs an 02 sensor.i had the air/fuel ratio recalibrated.do you think i purchased a defective eha? im going to check into the coolant temp sensor,does anyone know wich coolant sensor is the one that controls air fuel,where is it located? thanks for all your help guys.the car starts ruff when cold,needs to warm up 3-5 mins,or will hesitate pop,buck,misfire,even when full warmed up,car lacks full power on highway in passing gear,it will not shift unless i lift foot off accelerator,also i noticed while it revs,the cars engine gains more power as i lift my foot off the accelerator.