defenitly wait to see if that new TCV you have ordered will fix it or not. These TCV's are known to go anyway (I always have a spare and recently changed mine as well)
Does sound like a sensor issue though, unless there is a leak. Did you have the garage smoke test it? probably check the pipes for any splits / leaks.
If the MAF sensor isnt throwing any codes might be an idea to look at the MAP sensor as well? I think I have a spare sitting around somewhere.
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