I have a 2011 F450 V10 Gas, and 2 days ago I went to start the truck and the battery was dead. Inspected it and found acid all over the top of the battery. Replaced the battery, but noticed the truck not running right. Idle is surging from 400-1100 RPM, and when attempting to accelerate the truck sputters, RPMS drop ans a second later it takes off.

Checked voltage at the battery, only had 12.5v when the truck is running, so concluded that perhaps the alternator had fried. Installed a new alternator, charging at 14 volts now but the surging and sputtering is still there. Truck has no check engine codes.

Any idea what in the world could be causing this?