Engine Performance problem
1999 Dodge Ram V8 Two Wheel Drive Automatic 131275 miles

My vehicle was running rough so I had the fuel injectors cleaned and the vehicle ran great for about a month after which it started running rough again. I talked to Dodge mechanic who told me that the condition was probably being caused by a leaking Plenum and or intake gasket. The other problem that started about the same time is that when I accelerate the AC vents cut off or switch to the defrost vents. Are these 2 problems related and how do I fix it?

Thanks

Ok if you do have an intake leak then yes it can be related. You allready have lose of vacuum so you step on gas and lose more vacuum.
You first need to check your antifreeze level are going through anti-freeze? If so then I would get an iintake and plenum gasket set and change them if you can otherwise take it to a trusted shop.