Fuel Injector problem

Hi all again,
As stated in a previous post, I siphoned the gas out and replaced the fuel filter. (I buy my gas at Murphy USA at Walmart, so I know the fuel is "fresh". After I bought the gas, I drove for 30 or so miles without any problems, after it was parked for 40 minutes and then tried to drive it again, we only got about 3 miles and it stalled. We were able to putt back home the 3 miles. Today I added the Sea Foam to the fuel and the oil, expecting it to smoke etc, etc, like I've seen on Youtube, I got a few puffs of smoke but nothing compared to what I saw. It did not magically fix the truck as I had hoped. Here's another "symptom" if you will. To stay running (not at idle), I have to gently pump the petal, if I attempt to hold it or "gun" it the engine revs for about a half of a sec and then it's like it is getting no fuel at all. It tries to cut out. I gently pump the petal again at a heat beat pace just to get it to stay at idle, as soon as I stop pumping, the truck stalls or almost stalls. I think the bad gas theory has been tested and that is not the problem. The only 2 things I know to do next is change out the fuel pump or the sensor on the TB assembly. If my fuel pressure is lost wouldn't repairing these items fix that problem or is there something else I am missing? Any other suggestions?
Thanks again for all the help!
Laura

Engine Mechanical problem
1997 Chevy Suburban V8 Four Wheel Drive Automatic

97 chevy 5.7L 350

I needed to replace intake manifold gasket. Removed it two years ago. I had thoroughly cleaned the intake manifold and its surfaces. I have no garage, live in the hot New Mexico sun. So I waited for a moderate day but hurt my back so two years went by.

I had put a clean white towel over engine block and was laying the manifold back in place until the last day. Long story/short, some New Mexico windstorm had blown a little dust down into the fuel delivery ports (for lack of better term).

This is a high mileage vehicle so I do not want to pull the heads but I need ideas how to get as much dust as possible back out of those ports even though there is very little.

I plan to blow them out with air compressor. The perhaps shove some rags with carb cleaner on them and wipe around.

Any other ideas? Or should I just give in and pull the heads? Even if I pull the heads will I be able to access those square ports entirely?

Also, can I assume it is safe to dunk the whole fuel injector assembly and injectors in carb cleaner?
Thanks in advance.

Hello,
I've uploaded a couple videos on youtube, could you please view them and give me your opinion.
Thanks.

http://www.youtube.com/watch?v=_0mqfYJn4jw

http://www.youtube.com/watch?v=tYnHUrmekCA

Yes, It is TBI. What I was trying to describe in the video is that there is an "air" sound or a shhhh sound. You can hear it best when she stalls. This sound was never present prior.
Someone had told me to look for a vacuum line going into the Trans, but I can find it.

Just a short recap.
Ran perfect prior. Put about 10 gallons of gas in at Murphy USA, drove 40 miles without problems. Parked it for about an hour, went to leave again and she drove fine for 3 miles then stalled, and continues to stall, putted back home. Parked it.

Changed the:
Spark plugs
Fuel Injectors
O2 Sensor
Inline Fuel Filter
Added Heat
Siphoned out the gas.
Add 3 gallons new gas
Added Sea Foam

I've have searched for a vacuum leak but can not find one.

I can hear the fuel pump engage. (Assuming it's not that at this point.)

To rev the motor I have to "tap" the accelerator petal - If I "floor it" it cuts out and stalls.
Sometime she will idle roughly, if I take it out of Park she want to stall.

So I finally installed a used PCM and that fixed the problem! Thanks for hanging in there with me on this.

Thanks again for all your help. :)

Laura