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anyone please help!!

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i'm new to this site but i have some friends who are on here and swear by it.
so i hope you guys can help.

i have an 03 Tahoe that dies under a load. only if the engine is warm. for the first 1/2 mile it's okay but when i slow down to turn or stop at an intersection, it dies unless i put it in neutral. i have to drive my automatic like a manual.
i replaced all the plugs. that didn't fix it.
i cleaned out the fuel filter. that didn't fix it.
i really don't know what to do.
any help at all would be great
i was told it could be my oil pressure switch.