Car idles fine when cold but stalls after warming up, and RPMs drop too low when returning to idle after revving, despite replacing throttle body and checking for vacuum leaks.

No single comprehensive diagnostic tool that correlates engine warm-up behavior, sensor data, and idle control to pinpoint the root cause of stalling after warm-up.

Severity

3Medium

Willingness to Pay

implied

Added

May 6, 2026

Implied Software Gaps

A diagnostic tool that accounts for thermal operating conditions and provides targeted troubleshooting for idle-related stalling issues.

App Concept

AutoDiag AI

A cloud-based diagnostic assistant that guides DIY mechanics through complex engine issues. Input symptoms and replacement history, and get a prioritized list of likely causes with step-by-step test procedures. Learns from community data to improve accuracy over time.

Key Features

Symptom-driven diagnostic engine
Community-sourced repair data
Step-by-step test procedures
Elimination-based troubleshooting tree

Target Users: DIY car enthusiasts and small auto repair shop owners working on modern vehicles

Revenue Model: Freemium with $9.99/month premium tier for unlimited diagnostics

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