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Most often a Clogged or Restricted PCV valve is the cause of rough idle,Stalling,and Reduced Power/Acceleration.I'm not sure about it's location on a 94' 4.7L,on my 87' 5.0L its located on the lower intake plenum under the air intake manifold.If you hav'nt changed it in at least the last 15,000mi this is most likely the problem,and something you'll want to take care of very quickly because,it will also cause lots of sludge to buildup on the Valves and everything inside the Crankcase,also contaminating the oil and filter,A good shop should'nt charge more than $20-30 to replace it for you.Good Luck!
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