FIESTA RST ticking over lumpy on idle please help

[kriscrst]

my fiesta rs turbo isnt ticking over right, there is a small blow in the exhaust where the mid section joins the down pipe, so i am wondering if this has anything to do with it, it also hesatates when accelerating lightly, remap maybe??? also when boosting in 3rd gear, the fiesta tries to chuck it, leaving me very embarresed when scoobys nd the like are right beside me, 1st and 2nd are fine, when it happens i turn the ignition off breifly and its fine untill i accelerate hard again............ plz help. thanks, kris.

[andy-xr]

Have you chipped it? And if so, which one and which injectors?