hey right now i have a 88 v-6 2.8 liter automatic camaro. I have owned it for about a year now and just recently a problem has occured. When i am going down the highway and i go to pass someone and give it some gas but not to make it down shift it starts running really bad like it is only running on 5 cylinders. The spark plugs are new but i don't know what else could be wrong with it. Any help is greatly appreciated. thanks eric