1996 GMC Truck P1351 Fault Code: Slow Crank After Idle, Spark Present

I'm experiencing a P1351 fault code on my 1996 GMC truck. This is a high-current-related code, and the vehicle starts normally when driven daily. However, after sitting for several days, it takes a noticeable amount of time to crank before starting — it eventually starts and runs smoothly without any further issues. I've confirmed that spark is present during cranking, which suggests the issue isn't related to ignition timing or spark delivery.