Hi,

I suspect the crankshaft position sensor to be out of order ...
How to test it, it is a three pin model.
I'm not a mechanic and have only few tools ...

And, no it's not possible (actually ...) to get the DTC code. See https://blazerforum.com/forum/2nd-generation-s-series-1995-2005-tech-41/%5Bblazer-99%5D-cant-read-dtc-nor-access-ecu-37832/ for more informations.

 

It probably would be better to keep everything in one thread.