1. For undercoating what all do you suggest I cover before I spray paint everything ?

2.my truck this morning when I was turning on a road just shut off while I was turning on a busy road . I turned it off and started it again and it was a long drawn out start then it worked again .. what could this be ? I had auto zone check the battery and also the alternator . All he said was that the battery With truck off was 13.3 volts which he said is high with it on it runs where it should .

1991 Ford F-250 lariat 5.8L 351w only 68k miles

cover all electronic parts, including the oxygen sensors on the exhaust. /dying while turning can be many things, but try this cleaning first https://www.youtube.com/watch?v=NWCKvU2FmDc

Thank you so much