NYAudiA4B6

Multiple codes came up when I scanned my car Audi A4 03 1.8T:
P0300 - Random/Multiple Misifire
P0301 - Misfire Cyl 1
P0302 - Misfire Cyl 2
P0303 - Misfire Cyl 3
P0304 - Misfire Cyl 4

First tried to Resolve the Misfiring, replaced all coils and plugs , but misfiring still occurred. Took it to Audi and they told me it was due to faulty wiring to ignition coils. Wiring was replaced and misfiring stopped for a couple days, but today random misfires began to occur again and check engine light turn on and was flashing. Any suggestions on what else it can be?

Also other codes came up:

P1297 - Connection Charger Throttle Valve Pressure Drop
P0238 - Turbocharger Boost Sensor Circ. High
P0106 - Map Circ Range Performance

What can I do to fix these problems?

random car problems occurring:
When car is in Park or Neutral the tachometer is constantly revving between 1500 - 2500 rpm, but drops down to normal under 1000 when it is put in Drive or Reverse. What can cause this?

Also, information display signaled having low oil, but when checked it was regular. Then when I screened it again everything came up OK. This had occurred twice. What can cause this?

Any feedback and help would be highly appreciated.

3707

I had several misfires as well, car stalled frequently and oil warning came on.

Initilly thought it was plugs, wires, coil pack , etc but when I was no longer able to connect with VAG-COM it was clear the ECU was dying.

Car runs like a champ with a new ECU.

Your case might be different, but it is worth a try since you already replaced the obvious stuff.

ScratchRob13

causing misfires do to incorrect fueling... you have boost guage?