noonecanfixmyblazer33705

So I bought this blazer a couple months ago and I cannot fix this stalling issue no matter who i take it to. Not even the Chevy Dealership could properly diagnose the problem. Basically it has always had a rough idle (wants to stall). The gas gauge has never worked properly. As long as I have below 3/4 tank of gas I usually can get around with no issues. However, when I fill the tank the blazer bucks and tries to stall every 5 miles or so. I can usually keep it alive by stomping on the gas, but it feels like someone is hitting an on/off switch on the gas. Here are all the repairs I've had done so far to try and fix the issue...

1) new fuel pump
2) new plugs/wires/cap/rotor/flushed all fluids/throttle body cleaned
3) no readings on any of the sensors.. mass air flow sensor was replaced
4) ECM replaced
5) Tank was dropped, nothing wrong found there.
6) new muffler/Cadillac converter cleaned.
7) new planor gasket and fuel pressure regulator

Any wizards out there that can help? I am about to blow this POS up!!!!