Ignition module issues
I have a 1999 Subaru Outback with about 195,000 miles. It's always run great except the check engine light started going on and literally 30 seconds to a minute later, the car would die. All I had to do was restart it, the light would go off, and the car ran fine for a couple more days until it did the same thing again. (It happens mostly when I slow down abruptly or let the RPMs get below 2500 following a downshift). The accessory lights (like on the heater buttons) are dim and often don't even light up anymore. The most recent issue is that I will hear faint "click" and the car will gain horsepower, then it will click again and will lose horsepower. This tends to happen several times within a minute, and it happens without any change in my pressure on the gas pedal. My speedometer also dies all the time and randomly bounces up to speed and back to o MPH constantly during drives. Possibly ignition module? I have to make an 8 hour round trip drive in a few days, so is this something that should be taken care of ASAP? And how expensive can this replacement get?
It might actualy be your alternator. I had a friend have the same problems your dealing with and that fixed it. I would go to your local parts store, most of them have a tester.
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