rough cold start...hesitation on takeoff

[Explorerkid56]

I NEED HELP GUYS! i got a 99 explorer, and when i start up the truck, its a rough start and has a rough idle for about 30 seconds. then its fine, if i go to pull out of my street, it starts to buck, and hesitate almost like there is no power. i brought it to my garage and this is what we have done so far... replaced fuel injector, upper and lower intake gaskets, maf sensor. after replacing the gaskets, it went away for 2 days and now its back. anyone have this problem that has fixed it?? ive read around and does the IAC have anything to do with it, thanks guys

 

[Donner]

Hi there!

What type of fuel do you use? Regular station?

 

[dmac0923]

The IAC would give you the idle problem described. if you have time do a search on the IAC on this forum and it makes for some interesting reading.

the IAC Valve is a culprit along with vaccuum leaks for bad idles. the IAC is an easy access item, so it never hurts to clean it