I got a 1990 mustang gt and just added some 10.4mm wires and now car is acting funny. Running high rpm and push the clutch in the voltage and rpms drop till it stalls. I have to feather the has a couple times then it will idle. Please help

 

Welcome to the site, and please take time to learn the layout. Every generation has a section devoted to it for questions about your car.

This section though is for:
So unless somehow using the forums is causing your issue ...........