Intermittent blue smoke at idle?

[Badlander]

Hi everyone. I have a 2008 f250 that has the dpf/cat delete,and egr delete. with the gearboxz 4.0 with economy tune installed. my truck will blow heavy blue smoke from time to time at an idle when its warm only. especially after short trips on restart. no oil loss and no coolant loss. and mpgs stat average 20-22 on interstate. can anyone help? thanks in advance

[AshevilleEngine.com]

I had a customer who had the same problem. He had used starting fluid a couple of times and burned his injectors up. Truck ran fine, pulled his 16K pound trailer with no problem, no loss of fuel mileage, but smoked so bad at idle that it was embarrasing.
My guess would be that you've got at least one bad injector.