docs: Add distributor cap/rotor part numbers for recurring maintenance

- Document GM part numbers: Cap 10452459, Rotor 10452457
- Include ACDelco Gold OEM options and aftermarket alternatives
- Note that distributor corrosion is ~1x/year recurring issue
- Provide cost comparison: OEM (7-85) vs aftermarket kit (5-35)
- Links to RockAuto, GM Parts Giant, A-Premium, eBay
- Helps with quick replacement when distributor cap/rotor fails again

PARTS-SHOPPING-LIST.md

@@ -0,0 +1,117 @@
+# 2002 Chevy Express 3500 - Parts Shopping List
+
+**Project:** Maintenance parts for 2002 Chevrolet Express 3500 (5.7L V8 L31)  
+**Date:** 2026-03-22  
+**Vehicle Mileage:** TBD
+
+---
+
+## 🔧 Distributor Cap & Rotor
+
+**Note:** Distributor cap and rotor are a recurring maintenance item on this van (~1x/year due to corrosion). Having these part numbers on hand allows for quick replacement.
+
+### OEM Parts (ACDelco Gold)
+
+**Distributor Cap**
+- **GM Part #:** 10452459
+- **ACDelco Part #:** DR2031
+- **Description:** Original equipment distributor cap
+- **Price (OEM):** ~$45-55
+- **URL:** https://www.gmpartsgiant.com/parts/gm-cap-10452459.html
+- **RockAuto Search:** https://www.rockauto.com/en/catalog/chevrolet,2002,express+3500,5.7l+v8,1434776,ignition,distributor+cap,7135
+
+**Distributor Rotor**
+- **GM Part #:** 10452457
+- **ACDelco Part #:** D465
+- **Description:** Original equipment distributor rotor
+- **Price (OEM):** ~$22-30
+- **URL:** https://www.gmpartsgiant.com/parts/gm-rotor-10452457.html
+- **RockAuto Search:** https://www.rockauto.com/en/catalog/chevrolet,2002,express+3500,5.7l+v8,1434776,ignition,distributor+rotor,7136
+
+### Aftermarket Alternatives
+
+**Distributor Cap & Rotor Kit (Budget Option)**
+- **Brand:** A-Premium
+- **Part #:** APIDC013
+- **Replaces:** DR2031, 3D1063
+- **Description:** Cap and rotor kit
+- **Price:** ~$25-35
+- **URL:** https://a-premium.com/product/1996-2002-chevrolet-express-3500-distributor-cap-and-rotor-kit-apidc013
+
+**Distributor Cap & Rotor Kit (Mid-Range)**
+- **Brand:** NGK
+- **Part #:** NG225ZH
+- **Description:** Cap and rotor kit
+- **Price:** ~$30-40
+- **eBay:** https://www.ebay.com/itm/176613477750
+
+**Distributor Cap (Duralast)**
+- **Part #:** DL1349
+- **Description:** Premium replacement cap
+- **Price:** ~$35-45
+- **NAPA:** Available at local NAPA stores
+
+**Distributor Rotor (Duralast)**
+- **Part #:** DR1349
+- **Description:** Premium replacement rotor
+- **Price:** ~$15-20
+- **NAPA:** Available at local NAPA stores
+
+---
+
+## 💰 Cost Summary
+
+| Option | Cap | Rotor | **TOTAL** |
+|--------|-----|-------|-----------|
+| **OEM (ACDelco)** | $45-55 | $22-30 | **~$67-85** |
+| **Kit (A-Premium)** | - | - | **~$25-35** |
+| **Kit (NGK)** | - | - | **~$30-40** |
+| **Duralast Separate** | $35-45 | $15-20 | **~$50-65** |
+
+**Best Value:** A-Premium kit (~$25-35) - Complete kit at lowest price
+**Best Quality:** OEM ACDelco (~$67-85) - Guaranteed fit and durability
+
+---
+
+## 🔗 Quick Links
+
+**GM Parts Giant:**
+- Cap: https://www.gmpartsgiant.com/parts/gm-cap-10452459.html
+- Rotor: https://www.gmpartsgiant.com/parts/gm-rotor-10452457.html
+
+**RockAuto:**
+- Cap: https://www.rockauto.com/en/catalog/chevrolet,2002,express+3500,5.7l+v8,1434776,ignition,distributor+cap,7135
+- Rotor: https://www.rockauto.com/en/catalog/chevrolet,2002,express+3500,5.7l+v8,1434776,ignition,distributor+rotor,7136
+
+**A-Premium Kit:**
+- https://a-premium.com/product/1996-2002-chevrolet-express-3500-distributor-cap-and-rotor-kit-apidc013
+
+**eBay (NGK Kit):**
+- https://www.ebay.com/itm/176613477750
+
+---
+
+## 📝 Technical Notes
+
+- **Engine:** 5.7L V8 L31 Vortec
+- **Firing order:** 1-8-7-3-6-5-4-2
+- **Distributor rotation:** Clockwise
+- **Common failure:** Rotor center spring contact breaks off (causes no-spark condition)
+- **Recurring issue:** Distributor corrosion ~1x/year on this van
+- **Prevention:** Clean distributor housing and apply dielectric grease during each replacement
+
+---
+
+## 📅 Revision History
+
+| Date | Change |
+|------|--------|
+| 2026-03-22 | Initial parts list created for distributor cap and rotor |
+
+---
+
+## 🔗 Related Documentation
+
+- [CrankNoStart issue](./CrankNoStart/README.md) - Distributor cap/rotor replacement that resolved no-start
+- [PowerSteeringLeak issue](./PowerSteeringLeak/README.md)
+- [FuelPressureIssue](./FuelPressureIssue/README.md)