# 4 week quandary **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** impreza, stalling, driving, subaru\ **Created:** [March 7, 2010, 3:09pm UTC](https://community.cartalk.com/t/4-week-quandary/45688 "2010-03-07T15:09:31Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![jbureau](https://avatars.discourse-cdn.com/v4/letter/j/b9e5f3/32.png) [@jbureau](https://community.cartalk.com/u/jbureau)\ **Post date:** [March 7, 2010, 3:09pm UTC](https://community.cartalk.com/t/4-week-quandary/45688/1 "2010-03-07T15:09:31Z")
In brief: 1997 Subaru Impreza - While driving, car will just lose power and shut down. Car will start up again and go for a while before this occurs again. Happens very intermittently - no set pattern to occurance like going a certain speed, before it warms up, etc. So far have had the alternator replaced as well as the mass air flow sensor. 2 mechanics later (and still at the shop), cannot diagnose. Each time the mechanic(s) have the vehicle, it will not stall for them (of course!). Diagnostics do not indicate an issue. ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [March 7, 2010, 3:28pm UTC](https://community.cartalk.com/t/4-week-quandary/45688/2 "2010-03-07T15:28:33Z")
While driving, car will just lose power and shut down. Is there any pattern to this? Like after two miles, or after sitting at idle for some time. etc. ---
**Author:** ![jbureau](https://avatars.discourse-cdn.com/v4/letter/j/b9e5f3/32.png) [@jbureau](https://community.cartalk.com/u/jbureau)\ **Post date:** [March 7, 2010, 4:14pm UTC](https://community.cartalk.com/t/4-week-quandary/45688/3 "2010-03-07T16:14:52Z")
No - very intermittent. And has shut down at various speeds - anywhere from being on the highway to trying to park on the street. ---
**Author:** ![wentwest](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/wentwest/32/6073_2.png) [@wentwest](https://community.cartalk.com/u/wentwest)\ **Post date:** [March 7, 2010, 5:12pm UTC](https://community.cartalk.com/t/4-week-quandary/45688/4 "2010-03-07T17:12:30Z")
I’d look at the fuel filter. If its dirty there will be times when the fuel supply will be too restricted and the engine will stall. After a few moments or a minute or so the fuel will seep through and it will restart. This car is 13 years old and I’ll bet the fuel filters have never been changed. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [March 7, 2010, 5:44pm UTC](https://community.cartalk.com/t/4-week-quandary/45688/5 "2010-03-07T17:44:56Z")
Subaru’s used to have an unreliable ignition module, a little electronic part that triggered the coil. But chasing these phantoms around in the dark can be VERY frustrating and expensive.