Codes P0011 and P0021, does not respond when depress accelerator pedal?

This vehicle not responding when you start it first in the morning. When it idles for 30 to 40 minutes it will gradually begin to respond very slowly and when it responds, it cannot rise beyond 4,200 RPMs. And when you engage gear Reverse or forward, you will depress the pedal all way down and it will move very slowly and stop, I have changed the IPDM/ER, it didn't solve it. What could be the problem?