I just bought a 2001 forester sf5 sti, and have encountered a couple of issues I'd like some outside opinions on.
I noticed when taking turns the wheel will jerk to the opposite side of the direction I'm trying to turn. It's like it wants to straighten out unless I hold the wheel fairly firmly. The previous owner said it was an alignment issues but from what reading I've been doing that seems unlikely considering there's no pull either way when going straight.
I've also noticed a severe stutter and almost a flapping noise when I start to get close to boost. If I slam the gas pedal it jumps to about 2000, then up to 2500 ish back to 2300 ish, then up to 3000, and back to 2700 ish. It does this until I hit around 4-5k rpm.
I don't notice it daily driving except when I'm trying to accelerate through an intersection turn.
Previous owner said it was a spark plug, which I was gonna do anyways.
How likely do you think it's just the spark plugs and not some sort of boost leak?
Any outside opinions are greatly appreciated, thanks!