Won't take good acceleration when cold ; Loss of power HELP

[djpanfire]

Really don't know what to do
My explorer when cold will start normally it will go to 2k RPM and go back down progressively to 1 or 1.1. The problem occurs when you try to accelerate the RPm will drop and it will go into a bubbluly state. If you let it warm up a bit it wont do it but it's obvious that I have a loss of power (can hear the valve clacking when I give to much pedal) and it will sometimes hesitate when changing gear.
Changed:
IAC
FPR
Coil Pack
Spark Plugs
Fuel Filter
Fuel Pump
Check and clean injectors
Intake Lower and Upper gasket (did overhall)

Seems top me like it just not getting enough gas I don't know help anyone

PS: Was working really fine after the overhall was done. After that it took one week for me to feel and notice the power decreas.

 

[rustbucketMI]

Check your MAF as well as O2 sensor.

 

[djpanfire]

Thanks Man Changing the MAF did it. The reason why I did not take a look at it is because I had cjhanged it just before doing the overhall. Since it was new I assumed it was working properly
Thanks

 

[rustbucketMI]

happy to help, you know what they say about assuming . . . there is a old saying, when every probable answer does not work the improbable must be the answer