Been having problems with my 2002 325i. It's a five speed manual and whenever the car gets to around 3500-4000 RPM's the entire car essentially bogs down. It's as if the car isn't receiving any gas past this threshold. In second gear the RPM's refuse to get past 4000 RPM's even with the gas fully depressed. It has similar problems in every other gear, just second was the gear I chose to test it in. The bogging down occurs in every gear with the car sputtering and than reaching the eventual threshold where the RPM's do not increase and the car will not accelerate until the gears are shifted.
Any help would be appreciated.