2000 Ford F-150 Idle

Engine Mechanical problem
2000 Ford F150 V8 Two Wheel Drive Automatic

My F 150 4.6 V-8 will occasionally not idle when starting cold. I noticed this more when it was left in the rain. I saw a service bulletin where the windshield was not seated in those years, causing electrical problems on the firewall. I got a new windshield and it is happening still. Also when I turn the key, all guages spin to the max, then return to normal.