I purchased this truck a a couple of weeks ago with 71k test drove great ! came back a few days later and drove it home on my way back I made a pit stop and when I started back UP she started fine but remained in cold start mode kinda sounded like a frieght lighner or a blower motor no engine lights, well I got home fine next day I take it for a ride starts great its in cold start then goes away drives beautiful then I turn it off and its stuck I cold start the rest of the day what needs to be fixed?

 

I would start with some punctuation. The harder it is to figure out your question, the fewer people will bother to read it.

First, the easy stuff. You don't have a choke. If your Cold Start Injector was stuck open, it would be so rich I'm not sure it would even run (it would certainly throw a code).

You say it's in "cold start mode." What does that mean? Is it just that the idle is high? You could have a sticky throttle linkage, your ignition timing could be off, you could have a bad ECT (engine coolant temperature) sensor.

Do you get the "Check Engine" light with key-on, engine-off? If you don't the bulb may be burned out, and you're missing the Code you need to diagnose it.