GMC Troubleshooting Questions? Ask a Mechanic for Answers
I am real sorry your having all these problems
when this would not start up for you would the engine physically crank over and not fire up or the engine would not physically crank over at all ?
and once it started up and cleared out it was fine ? then if you shut it off again the same problem ?
is the check engine light on when driving it or at idle ?
are you near a Pep Boys or Auto Zone ?
if you are can you swing in and have them read the codes for you
they will do this for free and if you can tell me the code number set i will know what the problem area is
these type of issues usually boil down to vacuum leaks or a loose connector or possibly a mistake from the transmission install
as it seems a lot of these problems came about after the transmission work was done
how are you making out ?