My ampmeter is pegging

I have replaced the Check valve, the Voltage regulator, plugs, wires, and a rotor. But it still happening. After driving it for 15 or more minutes, when in low idle in drive or reverse, the car want to stall out, then when I put it in park, it will have a skip in the motor. Then if I let sit for a few minutes and start it up again, its fine, till I drive for a little while, it will happen again. Its killing me.