97' E320 won't rev past 4k
 

So I had my air intake blow off and it caused some lights to come on, such as traction control, abs and power steering for some reason. After I reconnected the air intake all the lights shut off but after that the car refused to go past 4k rpm no matter what. In park, neutral and even gears 1,2,3 and 4 (the semi mode) it refuses to pass 4k. I've been stuck on what to do and im just lost. IF anyone has suggestions on what I can do to solve this I'd be very grateful.

List of new stuff done to said car

Spark Plugs

Fuel filter and fuel pump

Oil and oil filter

Transmission fluid

Fuel pressure regulator

check engine light on? any codes? not enough info for the internet.