long story short i replaced the TB, including all the seals with new gaskets and newish iacv. put a new battery in the car, replaced the alternator, and did a boost leak test to 30psi with zero leaks. and still have a cold start issue. on first start it idles at 2000 rpm and dips to 1700 then back up to 2000 until fully warm then it goes back to normal. if i drive before its completely warm the idle will fluctuate from 1000 rpm to 1500 until warm. i am completely out of ideas of what could be wrong.

 

Have you adjusted the BISS screw in the TB? That or check around the IAC Sensor?

 

air in the coolant system ?

 

ive adjusted the biss screw and its set where the ecu is set to 0 so its where it needs to be, and i havent check the coolant yet so that will be next on the list.

 

I second the coolant issue.

Bleed it, if it still does it.

Check to make sure the IACV is operating

 

Did you clean the sealant (black, dirty-looking stuff) off the inside of the TB by mistake?

 

i bleed the system and still have the issue, the icav valve is working the way its suppose to so i dont know what else it could be, im thinking about just draining the whole coolant system and starting over to see that helps.

 

no i made a point not to, i cleaned the center but nothing around the edges so no air would leak

 

All vacuum lines are connected? Sorry to ask such elementary questions, but I always start with the basics, otherwise I tend to overthink the problem LOL

 

ive gone over it 4 or 5 times even after the boost leak test and i couldnt find anything that wasnt connected that should have been.

 

Fully drain. Fully bleed air in coolant system

 

Stock tune, stock car?

 

car is tuned, fp red, hks 272 cams, id1000 injectors, and full bolt ons. this problem has started about a month ago now, but its been on the same tune since the set up back in june with no issues what so ever.

 

What are ambient temps in your area now compared to June?

 

I hope u find the issue.