Hard to answer your question when you don't even list which truck and what engine. Look at the link below and pick the correct truck and engine. http://autorepair.about.com/library/firing_orders/bl-gmc-firing-94.htm
Click the link.
what is the firing order on the distributer cap on a 1994 gmc 5.7 liter
The ESC module is located inside the distributor cap. The ESC module is located inside the distributor cap.
what is the plug wire placement on the distributor cap of a1996 gmc 4.3 v6?
It does not have a timing sensor.It has a electronic timing controll module under the distributor cap on the left side of the distributor base plate.
Yes, it does, and a rotor.
I don't know what your specific problem is, but there is no distributor cap.
Follow the plug wires and they will go to the distributor cap.
at the back of the engine
Cracked distributor cap or bad plug wires
Follow the spark plug wires from the spark plugs. If it has a distributor cap, they will plug into it. It may not have one and have oil packs.