I own 1st gen rx7. ill start the car let it warm up and go down the road and the car will spit and sputter and blue smoke will come out the exhaust. the car willl not fall out of a tree if you pushed it. i replaced everything fuel filter, plugs, distributer cap, rotary button. cleaned the carb jets and everything but still no luck so i have come to the conclusion that its out of time HELP!!!