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99 F-250 Trouble starting and running rough
I have a 99 F-250 7.3L powerstroke. The truck has a real problem when it sits overnight (7 or more hours)...The truck will not start unless the block warmer is plugged in. Tempature does not matter, it can be 80 degrees outside and it still wont start if it sits overnight. If the truck sits for a few hours it takes a few cranks but will start. After the truck starts it runs really rough until you run it for about 30 mins. If I leave the block warmer plugged in overnight it will start without any real problems but it still runs rough until it gets fully warmed up. This problem has grown and is getting worse every day. Also the glow plugs are new and are working fine.
Please help I am lost and dont know what to do.. Thanks!