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1995 Subaru Legacy - Uneven and Rough at Idle?

• This problem seems to have started after taking my Subie to a new place for an oil change, but that could be coincidence. This is a 1995 Subie Legacy LS Wagon with just over 100,000 miles and a 2.2L motor. When I am stopped for a light or leave it running in Park, the engine seems to skip and the RPM needle will drop a notch. Then just when you think it will stall, the engine "catches" itself, the needle returns to its former position and the motor runs smoothly for about 15 seconds. Then the process starts all over again. It happens whether the A/C is on or off. Nothing happens when driving along. In fact, it is very smooth and an absolute pleasure to drive. A mechanic spent hours checking everything and-you guessed it-said there is nothing wrong. He even left it running for 1/2 hour with the A/C on as well as the radio and claims it didn't happen. He even went on the internet to ask other mechanics to no avail. I was told a little movement in the RPM indicator is normal and I'm OK with that. But the car skips or misses and then jumps backs up, sometimes very noticeably. It can get to the point where a vibration is passed through to the driver, which is painful for me as I have a neuro-muscular disease that makes me sensitive to any vibrations. Although my knowledge of engines is not great, I feel that this is something minor that is escaping notice. Otherwise, I couldn't ask for a better auto, but I also cannot live with this problem since I'm worried about taking it for a drive of 50 miles or so. My husband won't take it to work (yes, he noticed the problem also) since he comes home at night and has to go through the rough part of a town and is afraid that it will eventually stall and leave stranded in a dicey area. Any ideas? The mechanic said to bring it back tomorrow morning but since he didn't find anything the first time I'm not hopeful of getting a resolution on this. So I thought I would throw the question out there in the hopes that someone may have an idea as to what is going on. Many thanks.....Sharon

• Answer:

  Your '95 has several connections to the intake plenum. When the air filter is checked, the intake plenum has to be raised to get the filter out for inspection, and it is common to not get the connections back on securely. That will result in an uneven idle. There is one to the top of each rocker cover, for a total of two. There is the one that connects to the pcv valve, one smaller one below it that connects to the plastic plenum and then one about an inch in diameter that is usually the overlooked one, running from the plenum to the crankcase vent tube that goes up to the pcv valve. Double check them and make sure they have good connections. Especially the one about an inch in diameter.