for the last week in real cold mornings when i start my truck to let it warm up
when i come back out after 10-15 min truck is still idling at 900-1000 fully warm. Doesnt go down till i put in gear then will stay down. only happens in the morning. Anyone have any ideas of what to look for?

 

Bump for this, and also when starting, I have to hold the gas down for about 10-20 seconds before it will idle on its own. It only happens when it's cold outside. What should we adjust in Hptuners? Thanks.

 

Mine does that, but it's because I had to raise the idle set screw on the TB. Starts up @ 1000 rpm cold and then drops to 750. For some reason, at the stock screw setting my TB sticks shut.

 

Its really hot outside but my truck does the same When I start it It keeps like that for 5 minutes then the rpm goes down to the idle speed 700rpm

 

In EFI there is a Desired Idle Speeds table that is based on ECT. There is also a Heater Warmup RPM Offset that gets the speed up to get the engine warm faster. The Warmup table in mine goes all the way up to 176* and raises the engine speed 250 RPM in Park/Neutral. That is probably the table that is keeping your idle up. If your ECT is up to temp I am not sure if there is anything else causing the idle to hang until you put a load on it.