So my Honda Civic 2004 has an extremely difficult time going up hill. If I start to climb a hill and my rpm's approach anywhere near 3600-4000 rpm's my car begins to do what I describe as "stutter up the hill." My check engine light turns on instantly. In addition to this, I can start going up the hill at 70 mph; however, when the "stuttering" occurs my gas peddal feels like it almost gets stuck and won't push any further (even though it can go further down) and my speed declines drastically and quickly. My check engine light will usually go off 24 hours after I return to a flat surface and have driven on the flat surface for about one hour. I can always tell when the light goes off, because the tension in the gas pedal is relieved and my car drives much smoother. I have had the code read twice, and the mechanic said it was throwing a different code each time so he is not sure what's going on. I have had new spark plugs put in and I keep up with my oil changes if that helps.
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