I have read folks cleaning and cleaning and there is still blockage. I have also read some folks giving up and installing a carb with choke.
The TKS is suppose to make starting easier but time and time I hear folks say after a week the bowl goes dry and they need to crank and pump just like a carb with choke so they just install one and don't have the idle issues.
1997 2400 SCR
5.7 Vortec / Bravo 2