I have a 95 f-body with the 227/233, roller rockers, electric water pump, msd 6al, headers,etc. Back this summer, the car ran fine with no miss. When I came home from college, the car had been sitting for about 6 weeks. When I cranked it, it will miss at idle for about 30-60 seconds then go away. The car runs fine, just will have the miss at idle only when it is cranked after it is cold. I just changed the plugs and wires, and it is still the same thing???? Any suggestions. I scanned the computer with some of the scanning software, and I do have a custom tune in the car. Like I said, this just started. I dont want to just start changing all kinds of sensors. Any help is greatly appreciated.