denbo

About 3 mths i fitted a new Std T3 to my S2 and now am getting back fire when i come of revs which sounds very good lol is that ok or is their somit up ?

Went out in here last sat and it felt like it wanted to cut out on me it started to peak below 1000rpm which its never done befor. Next day i was going to pop and see a mate of mine and she would not start up, after 5 turns she did but she was like a bag of hammers and wanted to cut out again

Could this be the cold start valve ? if so i have taken it off and then tryed to turn the car over and its still the same

Any help would be great

Cheers Denbo