Fuel Supply & Injection (Other) - Fuel, Air & Emission Symptoms
Common symptoms and diagnostic guides.
Car runs rough randomly
A car that runs rough randomly often indicates intermittent engine misfires, fuel delivery issues, or sensor faults; systematic diagnosis is key to pinpointing the root cause.
Warm rush at stop signs
Warm idle surging at stop signs is often caused by fuel/air imbalance or sensor issues causing RPM spikes and unstable idle performance.