Alright, my 92 s10 wont stay on. . . two days ago when we fueled up I had asked for premium(never used anything else) the guy put in regular gas. as soon asthe regular hit the engne it started to get rough idled rough, spurtered and kicked out. we put some octane in the tank to even it out but she still wont run. starts up rough lasts afew seconds ten dies. anyone have any ideas? we have recently replaced the fuel pump andthe fue filter(like witin the last month)

Its a 4.3 liter with a cam shaft, headers, flow master exhaust system.