# Slow off the mark

**URL:** <https://community.cartalk.com/t/slow-off-the-mark/33309>\
**Category:** Maintenance/Repairs\
**Tags:** outback, acceleration, electrical-wiring, subaru\
**Created:** [July 13, 2009, 3:17am UTC](https://community.cartalk.com/t/slow-off-the-mark/33309 "2009-07-13T03:17:29Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![weekendwrench](https://avatars.discourse-cdn.com/v4/letter/w/ad7895/32.png) [@weekendwrench](https://community.cartalk.com/u/weekendwrench)\
**Post date:** [July 13, 2009, 3:17am UTC](https://community.cartalk.com/t/slow-off-the-mark/33309/1 "2009-07-13T03:17:29Z")

</div>

I have a 2001 Subaru outback with what seems to be an electrical problem of some sort. This has been going on for about 6 months now with stuttering at idle and a weak acceleration. I have done the following: Changed fuel filter, air filter spark plugs and wires, Checked vacuum and that is ok. I also changed the throttle position sensor and ignition coil pack. The car is not now throwing codes, it had thrown p0302 and I changed the spark plug and wire, this caused the problems to stop for 2 weeks. The car then stalled and having idling problems throwing P0301, p0302 and p0304. Misfire in cyls 1,2 and 4. I changed the ignition coil pack again and the misfire problem went away but the rough idle and weak acelleration was still there. I then changed the idle air control solenoid and the rough idle went away but the weak acceleration is still there. How can I fix this?

---

<div class="post-metadata">

**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [July 13, 2009, 3:18pm UTC](https://community.cartalk.com/t/slow-off-the-mark/33309/2 "2009-07-13T15:18:15Z")

</div>

Before anything else, I’d check the compression to rule out problems there. Serious compression problems might render other issues moot.

So far you’ve spent a lot of time & parts on spark & air. Other than a new filter, what about fuel?

Check the fuel pressure - make sure to do it under load. Check the operation of the fuel injectors - both electrical condition and spray pattern. It is best if you have a repair manual.