What are the symptoms of a faulty car throttle?

[DelBeckett]

When a car throttle malfunctions, the following symptoms may occur: Unstable engine idle: The engine idle becomes unstable, with high idle speed persisting without dropping. The engine may experience difficulty starting, especially during cold starts. The idle may be unstable or nonexistent. When using a diagnostic tool to inspect the throttle, observe the data stream. If the throttle opening is excessively large, cleaning is necessary. Generally, replacement isn't required unless permanent fault codes are present. Engine starting difficulty: If diagnostics confirm the throttle fault is permanent, the throttle must be replaced. Insufficient engine power: The engine exhibits poor acceleration performance and unstable operation. The throttle should be replaced as it's generally not repairable through disassembly; the entire assembly should be replaced.