Well, we couldn't renew our family minivan's insurance because it failed our provincial air emissions test. It is an old 1988 Plymouth Grand Voyager Limited Edition and I guess the engine's seals were faulty. My dad had our minivan's engine rebuilt last week. The engine runs smoother now but lacks power - no pickup at all. It struggles uphill even though it is a 6 cylinder engine. The mechanic said that it is because the engine is new and hasn't been broken in. But we can't help but wonder if it is because he did a bad job. Is it normal for a rebuilt engine to lack power at first? How long before the engine gets back to normal?