E46 320d Idle problem
I recently purchased a 2003 320d (facelift) Automatic. The car has 130000km. The problem i have with the car is when you put it into reverse or drive the idle is fine for about 10 seconds then gets very rough like its going to stall but never does switch off. In park or neutral is fine but every now and then you hear like a missfire and also when driving you hear a missfire now and then. The gears are selecting fine and there doesnt seem to be any power loss.
I got a mech to run a diagnostics on the car and the following faults were found:
Fuel Rail Pressure sensor
Also he noticed a pipe was disconnected from the recirculation valve and when connected made the idle more erratic
Any advise on what to try or change first to get the idle sorted?