Got it fixed. Spoke to a few Komatsu dealers and found that the delay is inherent in all IC Komatsu forklift trucks.
The problem causing the truck to be in limp mode was when we took off the control valve cover to replace the gasket we needed to unhook the accelerator linkage and in doing so it messed up the accelerator pot. We recalibrated the pot and all is fine.
Maybe we should have a forum dedicated to inherent problems that can't be fixed in particular make or model trucks. I can think of a few......