I wouldnt replace the injectors till you get this electrical issue worked out. Id be willing to bet its a wiring issue with a bad connector or wire rub through. I think above the driverside valve cover there is a wire that can rub through and cause issues like this.
Other things to try before getting new injectors (which I dont think new injectors would help.) Try disconnecting the ICP sensor and seeing if it runs better. If it does, get a new ICP and your good. Id also try a buzz test, that would help determine whether your IDM is good (but it isnt the only way to decide whether its a good/bad IDM.)