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Block Test: Can't suck any more air, is this normal? (1999 Suburban)

I performed a block test recently to diagnose a problem I'm having. The liquid stayed blue, but I want to clarify I have done this right. The purpose of the test was to see if I could prove a head ...
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I have a GMC Acadia

When I put it in reverse it stalls on me and shakes on me. When I put the gas for it to go back, the mph won't rise at all. I have to put it in park and then put it in reverse again. Then it goes ...