so I have a 96 chevy blazer that runs great for the most part at 140k today out of no where it stumbled coming up a hill once at a stop light and a few times down the highway on the way home when it cuts out it feels like a dead miss or like the engine just isn't there for a moment and then comes back and its just fine is this a common problem or if anyone has any insight on what to test first thanks ....keep in mind it did do it once at idle