Removing the doghouse isn't a monsterous job, especially on your year van. Getting in there to see the stuff that's behind the intake (distributor and other stuff) is important. Even in my 89, arguably the most difficult style dog house to remove, I can get it off and back on in 30 minutes.
Vacuum test ,,, but it used to be if it rattled or not ,, but since they only cost about $2 it is simply better to replace it , pull old one out , push new one in , no tools needed ,, it is important to make sure to get a good quality part , specifically made for the engine application ,, many look just alike and it is easy to get the wrong part installed if not carefully matching it with the right part
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