I am baffled I need help bad

[Liquid_silver]

Alright here is the problem as well as I can explain it.

About two weeks ago I noticed a loss of power in my car under full throttle. I chose to ignore it thinking it would go away. Then a few days later I noticed it started to stumble under full throttle. I decided that weekend I would replace the plugs and wires. A day or two later it started to stumble while moderate throttle in all gears. So that weekend I bought denso iridium plugs took it for a drive and it really didn't help. I replaced the wires and it seemed to fix the problem but it slowly came back. I then took it on a drive later that night and turned on heater fan while idling and the car stalled after I restarted it, it didn't want to idle right dropping so low it would want to stall and it did a few more times. I then checked the connection in the ISC and it seemed really loose so I took it off and reconnected it whish seemed to fix the problem better then the plug wires did but then it slowly came back. The connection is loose and when I tighten it back down it seems to fix the problem temporarily every time, but can a defective or poorly connected ISC cause the car to stumble like that while accelerating? Can someone help me.

 

[Damn 2nd Gear]

check to see if you have any intake leaks.

 

[Liquid_silver]

Already did tightened and adjusted all connectors for the i/c piping haven't checked for vaccum leaks either I will today if I get some time.

 

[Damn 2nd Gear]

also make sure taht you still have the biss screw. sometimees it will back out and fall out. so i dont have much knowledge on the ICS. i just had a similar problem with my car and it was one of my couplers came loose on my CAI. makes the car run way lean.

 

[laserboost]

My old 2g n/a would always stumble under full throttle and the problem was the fuel pump.

 

[Liquid_silver]

Alright I was afraid it might be the fuel pump and I kinda want it to be so I can upgrade it. I want to be sure because I hate replacing stuff and it not fix the problem. I also have checked the BISS screw and it is intact.

 

[Defiant]

I chose to ignore it thinking it would go away.

Not your best course of action. Cars don't "heal".

Pull your ECU codes, see if they give you a direction.