Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 92 f150 300 6cyl. runs very rough,will not idle until warms up › Reply To: 92 f150 300 6cyl. runs very rough,will not idle until warms up August 29, 2020 at 7:45 pm #963412 russell fishbackParticipant Yes I agree Bad MAP sensor probably… it was very cheap. The fuel pumps continuing to run is a new issue. started with this problem.