I own a 1995 Chevy 1500, the truck has been sitting for close to 6 months and wanted to get it running again, I changed all 8 spark plugs, new battery, new fuel filter, ignition coil, distributor cap, rotor, throttle position sensor, and ignition control module. After changing all those things, the truck started right up and idled about 5 minutes and sounded good. So I went to drive it around the block and the trucks RPMs started jumping up and down and the truck wanted to stall out. I took it home right away and the truck stalled at idle. I went to crank it again and started right away, after a couple minutes it stalled again during idling. And eventually the truck wouldn’t start again. The next 3 following days the truck wouldn’t start again no matter how hard I tried. Then on the 4th day it cranked first try, and did the same symptoms before, stalling during idling.

my question is...

what’s causing the truck to periodically start and not start

what may be causing the rough idle that eventually stalls the truck out

 

Do a fuel pressure check. Might be the fuel pump.