Toyota Liteace 1993.

I only experienced this problem after loading up on 95-octane ProTec gas at Total, testing lang kumbaga. What happened is that the engine dies if I'm not revving it, even during coasting. Pina-drain ko na, then proceeded to load up on regular unleaded fuel. Already tried revving for some time para gumapang yung gas sa fuel lines pero ganun pa rin. Malnis naman daw yung fuel filter nung pinasilip ko. Anything else I need to have checked?