H.RST

Hi ive got an escort rs turbo and since i bought it, it has not run right and ive only had it on the road for 4 weeks! when it gets hot it feels like the clutch slips in 3rd and 4th, it mostly sounds like the turbo is going mental but the car isnt moving it sort of dies and sometimes when you really floor it, it revs up makes a loud noise then it sounds like the engine dies, but it doesnt cut out it just stops reving then it back fires? ive changed the clutch today myself thinking that would be the problem solved, but its still the same, just cant think for what it could be??

any ideas
cheers