93 sierra 350 eng tbi when you start it cold runs for 10sec stalls then 20 sec stalls, then 30 sec stalls,then 40 sec stalls you get the picture this continues untill it will run for about a minute and with pumping the gas you can keep it running for a couple of minutes and then it will be fine as long as it dosen't cool off.
Checked timing, fuel pump replaced four months ago with filter. ign module changed, iac cleaned no change. egr changed 4mths ago.
used code reader its not throwing any code except brake swicth circuit
problem I don't think thats related as thats been happening on and off for awhile.
any ideas I've done all I can think of so guess I'll pay the mechanic for a scan.

I have a 1993 k1500 5.7L, 219,000 miles. I have the same exact issue and am working on it. You will not find any codes I don't think, as I haven't. Unless you MIL is on there probably isn't a code.

I'll let you know if I figure this out.

Got Mine Fixed After Sending It To Mech For Diagnosis After Extensive Testing They Put Fuel Pressure Tester On 13lb On Start And Down To 5lbs Replaced Fuel Pump Runs Fine.
Do Not Use Aftermarket Fuel Pumps Mine Was 4mths Old Delco Was $73 At Dealer. Parts Man Said Common Problem He Says Keep At Least A Quarter Tank To Keep Pump Cool. Good Luck.
Ron