Hello everyone, i am new to the forum. I am a dodge mechanic by trade but own a 99 7.3l. My truck used to never start when cold, even fair fall days. I replaced glow plugs and relay from diesel logic last spring. Truck starts everytime , even at zero degrees, not plugged in but always smokes white, no matter if 10 degrees or 90 degrees. Eventually clears up.at my shop, when truck is parked inside overnight,i start it in am and garage is flooded with smoke?also, truck has 180k on it, and truck lacks power as i am used to cummins trucks. I sometimes pull a car trailer to pickup vehicles and truck does struggle. No misfires or cel on but seems underpowered.fual economy is somewhere around 10 mpg(not towing). Any insight would be appreciated. Thanks