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Hey everyone, new to the site but I have a 2002 f350 super duty XLT, 5.0 engine that will stall out when I put the truck into drive and reverse. The same thing occurs too when I turn on the headlights, however, turning the interior lights on, along with the radio and heat vents on high, the truck does not stall. Originally, I had error codes for the mass air flow and something else and when I spoke to Friendly Ford to find out where the MAS was, they told me it was way under the manifold and so I had to take apart the whole manifold to realize where it's true location is. After I put everything back together...correctly the engine runs again and sounds a lot better, but I'm bamboozled as to why why it just keeps stalls when I put it into drive and or reverse. I think it may be caused by electrical something by having a heavy load on by changing into gears but I don't know. If anyone could offer me any advice, I'd really appreciate it.