Starts and shuts off

Hi and thanks for using 2CarPros.com.

This could be the result of many things. First, if you are able to keep the engine running by pressing the throttle, suspect a plugged or faulty Idle Air Control valve (IAC). This component maintains engine idle speed. It is located on the throttle body. I have attached a picture for your review.

Next, confirm that you are not losing spark or injector pulse once the key is released to the run position. Here are links for checking:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

https://www.2carpros.com/articles/how-to-test-an-ignition-system

https://www.2carpros.com/articles/stall-at-idle

Some additional thoughts. Make sure you have a 5 volt reference to the opti-spark ignition control module in the distributor.

Let me know if any of this helps.

Joe