Ok, not too long ago we replaced the heads on my 2000 GTP....before we replaced them, it was missing on 3 and 5, after replacing them it was still missing on 3. I was out the other day and was leaving a toll booth, the speed limit was 65, so I got up to 70..not doggin it, just nice normal acceleration, decided I was gonna get up to 80 and set my cruise...once I hit about 75ish..it was kind of like the car choked out..did that a couple of times, then white smoke(steam, whatever) started pouring out of the exhaust...pulled it over, the car shut off and the smoke was under the hood as well. massive blow by..the oil dipstick even gets shot up and smoke/steam funnels around it..what does it sound like to you guys?