1991 Chevy S-10 TBI INJECTION [ NO SIGNAL] NO FUEL

MY TRUCK IS IN THE SHOP NOW. THEY PUT A NEW DISTRIBUTOR IN. IT RAN GOOD ON TEST RUN THEN HE HIT A BUMP AND IT STALLED. THEY THINK ITS ELECTRICAL I THINK ITS FUEL. IHAVE ONLY HAD TRUCK A MONTH AND PREVIOUS OWNER SPENT ALOT OF MONEY ON A TUNE UP AND ALL ELECTRICAL AND COMPUTER PARTS. THE PROBLEM I AM HAVING IS STOPS AFTER ITS WARMED UP AND THE CHECK ENGINE SOON LIGHT FLICKERS ON A FEW TIMES BEFORE IT STALLS. THEN IT WONT START AGAIN TILL IT SITS FOR TWO HOURS OR SO IT SEEMS TO DO THIS WHEN ITS HALF OR LESS WITH GAS. IS IT ELEC OR IS IT FUEL? IF I HAD SEEN YOUR WEB SITE BEFORE I BOUGHT THIS TRUCK I WOULD NOT HAVE. I HAD AN 1985 GMC S15 WITH 575000KM 2.8L BEFORE THIS AND SCRAPPED IT! IM AT POINT OF NO RETURN NOW THANKS AND HELP PO"D AND BAFFLED.