I bought a used 93 Impreza with the 1.8L engine for my son recently. I thought it was a little underpowered when I test-drove it, but my son is a lead-foot, so I let it slide. As time has passed, I have come to believe that the engine isn't producing anywhere near the 115 hp that it should. Also, the gas mileage is poor. I have already changed the spark plugs.
I read somewhere else that it might be an issue with the timing pulley, perhaps it got over-torqued following a timing belt change. This would throw off the valve timing. But it didn't say anything about how to fix it.
I would appreciate any help I can get.