I just had a new head installed, automatically I noticed that my performace sucks... every gear is shorter and extreamly sluggish, can't even stay at 70 on the highway.

Now i'm getting a check engine light. when i check it out, it's a single, constant flash.

car would be a 91 civic STD.

anyone know what that means? i'm extreamly frustrated after paying almost a thousand dollars to get this stupid thing fixed.