I’ve been having some trouble with my 2006 Subaru Impreza WRX for some time now, but only recently has it gotten worse.. Here’s what’s going on:
At about 2500 to 3000 RPM, the engine will begin to stutter and lose power. By stutter, I mean the car will jerk as I try to accelerate. Acceleration during this time is minimal to absent unless I change to a lower gear. In a lower gear, acceleration is slow until I reach 3500 to 4000 RPM, then the car will accelerate as normal. After driving about 20 miles or so, the problem usually corrects itself but will reoccur either same day or again in a few days.
I have no engine modifications at all. I perform oil changes regularly. I’ve recently changed spark plugs and the fuel filter with OEM parts, as well as cleaned the PCV valve and MAF. When the problem first presented itself, I was still under warranty, but the service techs weren’t able to figure out what was wrong.
Any idea what this could be??
Thanks!!