It has a block heater even if it's plugged in and inside the shop it still dose t start like it should.

I have a 2006 ford LCF with a 4.5 power stroke that we have been Having starting problems with. The engine won't start right away when cold it has a long crank and you have to cycle the glow plugs twice before you even try to start it. Once it starts it has not power until it warms up. You can...