i have bullydog programmer, bullydog air box and filter, cat back mbrp 4" stainless exhaust, flushed rad in and out, cleaned cac in and out, cleaned condenser, and changed thermostat, fan kicks in fine with ac at idle cant tell goin down road. runs fine with no load. im thinking extra soot from programmer stopped up converter. any help or opinions?

 

Tks for your help! What a great site!!!

 

Maybe if you posted in the Cummins section?