Chevy venture stalled

why not finish the tuneup, spark and air filter.
also the EGR valve is a 50k service point.
if the EGR sticks open, Just before a stop sign driving
this is a sure sign of a stall ,by EGR. failure (clean it)
my pat gas.
so you are really saying, the rpm drops way below normal?
at idle , then stalls.
but the fast right foot saves the stall?
below 400rpm most cars stall. 300 for sure.
the CEL will flash on just at or just after the stall. RPM based action it is.
and if the stall is easy to save?" is it, super easy,? then the ISC is failing, the idle speed controller.
if on the other hand the skipped fuel tune up, its all nasty bad spark then all hope is lost , for ISC and ALL.
do the tuneup first, see the list?

Yea , those crossfire injection vettes can be a bear sometimes . I had dealings with them 84-85 - 86 working as a tech at a chevy dealer . Don't remember much about them , haven't heard anything about them for long time .

How's the fuel pressure ? Have you put a fuel gauge on it ? I would imagine you don't have a Tech 1 scan tool ? What's the map sensor voltage at idle ?

1984 Corvette hesitation stalling stumbling During Warm Up Only

1984 Corvette cleaning checking the check valves

change air & fuel filters, EGR valve, & PCV valves need replaced ! a tune-up may help your engine also, spark plugs, plug wires, etc., etc., check all vacumn lines, tighten all throttle body bolts, on so on, good luck

You've already eliminated the spark plug & wireset, distributor cap & rotor.
Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.

Components checked/replaced during a tune-up are:
air filter
motor oil
motor oil filter
breather filter
fuel filter(s)
fuel strainer
PCV valve
EGR valve
spark plugs
spark plug wires
ECM or distributor cap & rotor
cabin air filter
transmission oil filter
transmission oil
engine coolant
check all vacuum hoses and lines

Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:

Priority Action Part Type -- Cause
1 Inspect Battery -- Battery Discharged or Faulty.
2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned.
3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter.
5 Inspect Ignition Coil -- Faulty Ignition Coil.
6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter -- Starter Motor Faulty.
9 Inspect Fuel Pump -- Low Fuel Pressure.
10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch.
11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Drive -- Faulty Starter Drive.
15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat.
17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC.
18 Inspect Fuel Tank -- Fuel Tank Empty.
19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke.
20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.

could be several things, like dirty air filter, fouled spark plugs, bad gas, bad fuel pump, clogged fuel filter (probably located on the pump which is most likely located inside the fuel tank.) bad EGR valve, a vacuum leak... the list goes on and on. but most of these would cause a trouble code or service engine soon light to illuminate. if that light is on then you might want to get a parts store to read the codes for you and then repost with the results. good luckl

hi
check the all vacuum pipes is their any leaks.

Sounds like the fuel pump. it is in the gas tank and rather pricey for the Chev. trucks. easiest to drop the tank and clean area around it really good first.

CHECK FUEL PUMP FUSE AND RELAY.IF ALL IS GOOD.CHECK FUEL PUMP PRESSURE.IF YOU GET NO PRESSURE OR LITTLE PRESSURE.CHANGE FUEL FILTER.IF NO CHANGE FUEL PUMP BAD OR YOU HAVE A RESTRICTED FUEL LINE.

Could be fuel pump , fuel filter, alternator, have you had a tuneup lately changed spark plugs recently. try doing some of these things first. If you turn the key on and all the lights work probably not the alternator

dat sounds electrical check the alternator and all relay and fuses