Hi everyone, I’m new here with a 93 5.0 notch, I’m having some running issues with the car. It runs great when there is minimal electrical load, as soon as I turn on lights, a/c... etc it starts to run really rough and miss a lot, also tach will start to jump around. I recently checked all my grounds and cleaned them hoping that would be the issue. I noticed I’m having awful voltage spikes when checking voltage at the battery. Wondering if a bad voltage regulator or alternator has made any of your cars run rough.