had my car set up on the rollers last month and has been running fine up untill the last few days , now once it is warm it ticks over alot lower than it used to and when slowing down to a hault after prolonged high throttle it cuts out but the really strange thing is it is pulling like a train under full throttle even more so than when it was set up but if u let off of the throttle it pops and bangs out the tail pipe and spits flames out almost like anti lag . any ideas what is going on ??????

 

sounds to me like either your timings moved a bit or fuel has knocked it's self out

 

where u get it set up