Hey i have a 92 f-150 nite with a 5.0....I had a previous post with my nites problems but since then i managed to get it to start again finally had some bad wires and a bad siliniod.....but ill cut to the chase now.....It still has a mist to it and its rather annoying....the weird part is it does not mist all the time......when you first start it and drive about 3 blocks it runs great....then after that it runs like crap.....but if you have the gas pedal to the floor it will not mist or at least from what i can tell and my dad has been able to tell......i replaced the distributor cap, rotor, spark plugs, spark plug wires, and the o2 sensor thinking maybe one of them could be the cause but none of them fixed it.....so if anyone knows what could be the problem please reply back and let me know