2003 4.75l

Okay so here is the deal I have a 2003 gt with a mmr 4.75 d1pc 90 mm mass, stage 3 tf heads stage 3 blower cams, elderbrock Victor jr intake with 80# injectors. I just got the break in tune from mirilos in sa car was running fine got low on fuel refuled got a mile down the road dropped to 3rd and all hell broke loose started bucking what sounds like missing and loss of power. I dropped the tank cleans all that changed the plugs same with the same ones same gap cleans the fuel lines started it had throttle again but a miss would not hold a steady rpm regardless what it was like a miss went inside come out to start again and back to the way it was any ideals? Forgot to mention it has a rev limiter on it for 4500 rpm.