The car has good idle, no rough. but when i press on acceslerator slowly and equally RPM increases and when it reaches about 1500 rpm the tachometer stops increasing rpm although i continue press on acceslerator pedal, any ideas? i've replaced oxygen sensors, spark plugs, oil fuel and air filters, replaced Cranckcase ventilation system and hoses, maybe MAF? ICV? or Vanos?
see link to youtube
see link to youtube