i am having trouble diagnosing my issue i am having with my truck, i have a 3vze and it runs fine when warm but when its cold, ill crank it over itll fire and hit about 1krpm but right after that it dies. if i leave before the motor warms up its basically running like its a cold carburated engine (sputtering, engine dying if put under any stress and will not idle until it is warmed up). but when warmed up the engine runs like a champ. any ideas?

 

Faulty/seized auxiliary air valve and/or coolant lines to or in the valve are blocked