Few problems with 1.4L 16v 73kW

[tragfx]

Hi there,
I recently bought a Renault Clio 1.4 but since then it's gotten a few problems and I can't seem to diagnose what is. I hope someone here might be of any help.

1. The car sometimes has a check engine light and when checking it with an OBD it says misfire cylinder 3. So I replaced the spark plugs and the spark plug coils without any improvement.
2. When stationary the car is very shakey and it makes it very uncomfortable to sit in. (this goes away when driving)
3. When driving the car makes a weird numbing noise as if there are coils that are winding.
4. The cars revs keep dropping when stationary from the normal 750ish to almost 0 and sometimes it just shuts off the engine which is very unpractical at some moments. This also happens when driving slow which makes it almost impossible. (note: I do give enough throttle)

I hope someone can maybe help me understand this. And if these things might be related to each other.

Thanks

 

[White16valver]

2. could be worn engine mounts - maybe the engine is rocking and making the car shake?

3. Have you revved the engine when the car is stationary, to check if the auxiliary belt or another belt is making a noise?

4. I'm not sure if the 1.4 has an Idle Speed Control Valve? If it does, it might need cleaning.


I am guessing!

 

[Daz...]

It could be the injector on its way out.

Swap cylinder 3 injector over with one of the others and see if the misfire moves.