hey guys a friend of mine has a 2k GLE, the problem with it is that it won't rev past 4500 at all. i don't understand it. i checked the codes and she had on for a misfire. i changed the coil and cleared the code. it hasn't come back but still won't rev past 4500. i've looked at the throttle cables and nothing is catching it, i've cleaned the filter. not sure what else to look for. there isn't a code coming up, so if you have any advice that would be great. thanks .

 

mass airflow sensor very common issue.

 

Replace the MAF.