My 1995 Chevy s10 idols really fast and won't idol down. What can cause this?

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I have checked for vaccumm leaks,replaced tps,fuel pump,fuel filter,even one of the fuel injectors. It does out while driving. Once warmed up, it still idols really fast. But while driving I lose power and speed. Then engine dies. It starts back up but idols real slow like it's starving for fuel. What can cause this problem.