Code 34

Welcome to 2CarPros.

That is related to the manifold absolute pressure sensor. Here is a link that is meant to explain how to test this system, but I'm adding it because it has all the code descriptions:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

To be specific, the code indicates a low voltage (below what is possible). An intermittent may be caused by a poor connection, mis-routed harness, rubbed through wire insulation, or a wire broken inside the insulation.

With that, the first thing I would do is locate the MAP sensor and inspect the connection for any damage, make sure it is tight, and make sure there isn't corrosion in the plug. In addition, check wiring for evidence of a insulation damage.

I attached a picture of the engine and highlighted the MAP sensor so you fan find it.

Do this first and let me know what you find.

Take care and Happy 4th,

Joe

Welcome back:

Great! Glad to hear it. My buddy loves those cars and is on his 4th one, same year as yours. He got it three years ago with 45,000 miles. Now, it has 100,000. Lol

Take care and come back if you have questions in the future.

Joe