Spark plug gap for a 2003 Chevy astro van?

The recommended spark plug gap for a 2003 Chevy Astro van depends on the engine. The Astro came with either a 4.3L V6 or a 4.3L V6 with slightly different specifications depending on the year and exact model. You MUST check your owner's manual for the precise specification.

Without knowing the exact engine, I cannot give you a definitive answer. Attempting to use the wrong gap can lead to misfires and engine damage. The owner's manual will provide the correct information, or you can find it online by searching for your specific Astro's engine code (often found on a sticker under the hood).