Whats Wrong 1990 chevy lumina euro 3.1 ?

just got done with work, jumped in car started it started ,died, started rite up died, and so on,had to put it in neutral when coming to stop signs, with foot on accelerator, runs like a top with higher rpm, just low rpm stalls, when i got home, about 5 miles car ran fine, bad gas? egr valve? ignition module? idle control valve? pcv valve ? moisture in gas ? Any Ideas thx