2 things:
1.
I recently chaged my coils and my spark plugs. The parts are genuine volvo parts and now my care cranks about 10 times before it starts. It didnt do that before I changed these parts? I chaged the parts because my accelleration was lagging. The accel is fine now but the car takes extra time to start??? what can this be from?
2.
Also when im driving if I drive over any kind of bump in the road something rattles under my car and the sound is very noticeable.When my foot is over the brake pedal and I go over any bumps the sound will not exist.I looked under the car but nothing is noticeable. By depressing the brake pedal I am stopping it from happenig.... whatcan that be?

Help would be appreciated.

 

1. Maybe Fuel pressure is Bleeding back.

2.Maybe the Front Brake pads are flopping in the brakcet.

 

how can I check if the fuel pressure is bleeding back?

 

You would have to get a fuel pressure guage and install it and watch the fuel pressure.

 

I bet the noise you are hearing is the upper sway bar bushings. Same thing happened to mine. Make a terrible noice when you go over bumps ect. Let me know if you need to know more about it.