I have a 94 z28 m6 that I have been trying to get running better. My factory pump was bad so I bought a walbro, it went bad, then I bought a factory one and has been fine since...knock on wood.. The car seems to run pretty good when I first start it up then after it warms up it will miss at high rpm sometimes during acceleration and also a miss at low rpm will cruising. I was planning on doing the plugs and wires but this whole once warm thing kinda gets me. Anyone got suggestions? Thanks.