The engine takes 5 minutes to idle down after warming up. What could be the problem?

My car has a weird problem. Sometimes it takes two tries to start. What could be the issue?

It's normal for your NV200 to have a high idle speed of 2000 RPM when you start it cold, and then drop to 800 RPM after about a minute. This process helps the engine warm up. However, if it feels inconvenient, you might want to consult a mechanic to see if any adjustments can be made.

Does the T8 engine need to be warmed up?

Is there anyone with a Levante experiencing a ticking noise when idling after warming up the car? The noise disappears when you press the accelerator a bit. What could that sound be?

The engine warning light is on, and the idle seems unstable. The speed can still go up, but it doesn't accelerate as quickly as before. Could it be a problem with the throttle? Any insights?

What could be causing the Luxgen M7 engine to make a knocking noise when cold, but not when warmed up?

The engine takes 5 minutes to idle down after warming up. What could be the problem?

When starting a cold car, the idle speed takes 5-6 minutes to drop below 1000 RPM, and the engine vibrates. I thought the throttle was dirty, cleaned it, but it didn't help. The oxygen sensor current shows -0.01 mA. The repair shop says it's fine, but I feel like there's an issue. What could be causing this?

Is it normal for a 2014 Peugeot 2008 1.6 automatic to have the engine temperature rise very slowly, taking over ten minutes to reach 70 degrees? Could it be that the engine oil is too thick?

What could cause intermittent jerking at idle in a Jetta 7 after two years?