american outlaw

So three weeks ago while driving I shifter into third and gave ot some gas and it jerked a bit so I set it in neutral amd it idled miserably and staple out. I was rolling so I crank started it and it idled for tem seconds and stalled out again. I pushed it into a parking lot and couldn't get the engine to turn over whem I turned the key the starts motor would go but it wouldn't turn the engine over. The next day ot starts right up and I drove it home we assumed I bought bad gas and vaporlocked the engine (92 v6 toyota pickup) I drove it around for a while then yesterday it did it again, any idea what I'd wanna check? I replaced the fuel pump and filter about 6 months ago I have a new alternator and a new starter motor. Any ideas or help would be much appreciated. Thanks!