I don't know what it is, it just started happening. but what it is foing is a half or more throttle when it hits about 4700 it starts breaking up and dying and coming back and between 5500 and 7000 it starts spitin and sputterin and won't rev any higher. i've changed coil packs, plug wires, and plugs. but someone did make the coment the he had a similar problem and it was charging that there wasn't enough voltage in the system to run the coil packs.

any help would be much appreciated

 

We need a little more info on your car. Is it NA or Turbo? What mods are done? If you are an NA my guess would be that your 5th and 6th ports arent opening up.

 

sorry
Its an na the car is an 86 factory electronics with a S5 block. we modified the lower s5 intake manifold to fit the middle and upper s4 manifolds the all emissions have been removed stock port 5th&6th actuators have been removed and also i have T2 injectors in the secondarys and up until this point ran damn strong after my post earlier i went out and had the altenater tested and it was only putting out like 47 amps compared to the 70 it should be putting out im going to do the 3rd gen upgrade for the altenater and from all the information i have been gathering from my troubleshooting that seems to be the problem. but if there is anything you can think of let me know please cause this is killing me.