The car is a totally stock 95 Civic EX coupe. D16 SOHC motor. I just replaced the head gasket, and the car idled fine, no problems. When I first drove it after the hg repair, I noticed a hessitation taking off, below 2K rpm. And if I stabbed the gas, it would shake or stumble for the first few seconds, worse if the AC is on. Drove fine once at speed. I decided the timing belt was off a tooth or so, so I rechecked that. No luck, car still stumbles when taking off, unless I feather the gas pedal. Any clues? How do I check for codes?. Could it be a problem with the Vtec sensor? Please be specific with your answers, I'm very new to Hondas. And thank you for your support!