When you rev it up on park it wont get past 3,500 RPM. feels like engine is cutting off. Also check engine light went on and car now idles real bad. It misfires. took to a shop they saw that it needed egr valve and 02. replaced it and check engine light was fixed. But it is still cutting off over 3.5k rpm. ran the scanner and no codes. Replaced the throttle body sensor but still the same. Please help. thanks