I am new to threads so if somethings wrong I am sorry!

I have a 04 V6 mustang and when driving when I get up to around 45 55 and drive at that speed it starts to I guess I would explain it as jump.

Anyone have any suggestions?

 

Sounds like a suspension issue! However if the car has sat for a while tires could be flatspotted but that would be more of a violent shake

 

by jumping do you mean like surging power?

 

It like wants to give it more power then slow it down but it doesnt change speed that is just how it feels. Im not very good at explaining things. When your driving the car and the cruise is set at 55 you feel like the car like wanting to go and stop

 

So you have a pulse in the acceleration while driving, this does not happen at any other time? I could say some were in the spark, like coil pack or something along those lines but really not sure.

 

Yes, that is a good way to explain it. We have changed the coil pack and spark plugs and it did not help.

 

hey man that sounds like fuel, you should check the injectors ,probably one is not opening.

 

im gonna guess that your car is an auto??? if so, under normal acceleration, the trans goes into OD at 45, or it would at 55 under a little more throttle. so the trans could have something to do with it

 

That's what we were thinking injectors. My dad would be the one checking them for me and I don't think he knows how could you explain it or should I bring it to someone?

 

To remove injectors:
I just did this but its late and what I can remember is....

Take of the upper intake manifold, unbolt the fuel rail, unplug the injectors (you will probably break the lock clip), using a flat head driver take off the top injector clip, you could probably just pop the injectors right out and plug the new ons back in. Just reverse the process and your done.