Help! Truck spudders/backfires when cold!

[ReLoaDeD BuLLiTT]

My truck backfires/has a rough idle when cold, but by the time i get down the street to my stop sign, it smooths out and runs like brand new. Anyone know what this could be?

It's a 5.0

Any picture tutorials on how to fix this issue or a checklist of things to look at?

 

[fixxxer]

That really sounds like a vacuum leak, possibly the upper or lower intake manifold gaskets or one of the manifold bolts are loose.

 

[ReLoaDeD BuLLiTT]

I'll check all the bolts but less than 6 months ago I put in a new motor and all fresh gaskets and never had an issue until now. I was thinking it's almost like it's starving for fuel or something...i changed the fuel filter when i put the motor in 'cause it had been sitting for about a year. Maybe it's clogged up with more stuff?

 

[cjones101812]

check what affects cold performance...

IAT - Intake Air Temp sensor
ECT - Engine Coolant Temp sensor

 

[ReLoaDeD BuLLiTT]

Was an easy fix, thanks guys. Pulled the IAT and IAC and sprayed them with brake cleaner. They were disgusting. All better now