Do a compression test to determine if you have a valve problem or not and be sure the firing order is correct and don't forget to replace the rotor.
Its at the rear of the engine and a pain to work on where its wedged in.
Assuming that it has a 4.3L engine, it would be the distributor.
Gonna need to know which engine you have in there.
What year the vehicle is would be helpful and what engine you have.
Need to know what year and what engine to help you.
Assuming this is the 4.3L engine, the distributor cap would be found in the back of the engine on top. All the spark plug wires lead to it.
On the 4.3L V6 the distributor is located in the back of the engine, in the middle. Just follow the spark plug wires and they will lead you to it.
This sensor is at top rear of engine, next to distributor.
If it has coil packs, you can't.
If it has a V-8 engine, it is most likely at the back of the engine next to the distributor. IT screws directly into the engine block.
Assuming this is a 4.3L engine, it is located under the hood, in back of the engine, on top, close to the distributor.
If the engine is the 4.3, it is located under the hood, on top of engine, way in back, on the drivers side under the distributor.