Have a 1993 GMC 350 V8 Truck that many mechanics have worked on. When it is cold and you crank the truck it will not idle and when you pull off from a stop sign it is very slow about receiving gas and pulls off very slow. Everything possible has been replace but it is still not fixed.

Have you checked the Engine Coolant Temperature (ECT) Sensor, which affects fuel injector pulse width. The ECT Sensor is a temperature dependent resistor (thermistor), whose resistance decreases as the engine coolant temperature increases. It provides a richer mixture when cold, leaner mixture when hot. They become corroded, due to not changing the coolant frequently enough, flood the engine, and waste a tremendous amount of fuel.

If the problem persists, I would replace the Ignition Control Module (ICM)--AutoZone Part No. DR140, $38.99. This could easily be the culprit.