i have an fiesta rs turbo when i start it up in the moring it runs like shit but when it is warm it ticks over fine but on boost an just driving it. it cuts in an out not like an over boost but like it wants to go back an run like it dose in the moring

 

any ideas thx lee

 

well if it was me id try coolant temp sensor(back of inlet manifold),new plugs and leads...but a rolling road would be the best place..