So my truck has a very slight (I would describe it as a misfire) but it is was less dramatic than this stumble. I tried replacing my factory spider injector as I did find a clogged poppet valve. So immediately I was thinking yes this is it but no it was not. Job all done and back together and no avail stumble still there. Power is back although. Thanks for any information or help 1997 Chevy Tahoe 4X4 5.7L. -Mateo