Well the knock sensor did not fix it after all. I am now replacing the fuel pump with a higher volume and pressure fuel pump from a 1996 Vortex engine. Delco EP381 pump will now be used. I will know in a week or so if this fixes it as raising the fuel pressure at the TBI did help some. I am now at 15psi, but that is a bit high for the stock OEM fuel pump to handle and it will not last long at that pressure. The new pump will be rated up to 60psi.
Paw Paw