My car will start and run for about 1/2 hr then it will chug and stall. It will not start again until it sits for about 1 hr. Added fuel injector cleaner but problem still there. I can hear the fuel pump working each time. Can u suggest another area to check? I would love to pay you but am unemployed...

ever look at those old bad spark plugs
see tip s black and gap so wide my bill of my cap fit there, omg wrong.
or its flooding
when did this old truck run perfectly
never seen it.
last month, last year, last decade?
I can name 50 causes of stalls.
can the stall be avoided with fast right too, (zero tools test)
bad engine,bad spark and bad fueling are the macro causes.
leaking injectors
clogged injectors, or partly
FPR when bad and fuel pressure way way out of spec PSI, covered in the service manual this is and the injector balance tests. and leak down test
all shops know all this and know what tests to do.
gee 29year old engine is compression 150psi and up and near equal?
then spark checked, and spark tips clean. no oil, no carbon , no coolant on tips
and last fueling checks, got tool;s?

catylitic vonverter could be bad

When this stall or fails to start occurs have a pressure gage hooked up to the fuel injection pressure test port (top of engine in the pipe that supplies the fuel to injectors) and see if you are losing fuel pressure.

if the happened the engine should stall and die..if your lucky it might run again

did your mechaniic check the fuel injectors, it very possibly could be 1 of them acting up, also have your mechanic to give your vehicle a fuel pressure test, this will tell if the pressure is within the specs for the year and engine size that you have. also have him to check the coil, or coils, 1 of them could be heating up, and breaking down, and after cooled for a while, they have been known to work again, untill they heat up again. also have him to check the fuel pump relay to see if it is getting bad, he might have to tempoarily replace it with another one just to see if it is acting up.

try blowing out all the fule lines and changing the fule filters the lines may be blocked up also check the fule tank vent if this is blocked the pump cant **** fule from it

change fuel filter add 2 bottles heat tell fix ya bout me ok

check the fuel pressure regulator

With the upper plenum removed and spark disabled turn on the key and allow the fuel pump to prime while watching the fuel lines from the back of the intake to the injector. I suspect you lines are leaking. Have seen this before. ALOT.

possible bad fuel pump