working on a 94 gmc safari with the vortec 4.3l. its been sitting for about 6 months waiting for me to finish the motor swap (talk about a PITA), fire it up, time it correctly. and the idle surge, sometimes it dies when it gets too low. if you put the slightest touch on the gas petal, it stops, but idles too high. i was told a bad fuel pump, could it be the 6-9 month old gas?