HI,
The chip from tony at turbo systems i have chipped a few rs's and bought the chips from tony has he told u what to set the car co% to, and cruise fuelling to,or have u just had the chip fitted to the ecu and run the car, cutting out have u checked with strobe timing at idle, and cambelt timing,and when fitting the engine made sure all the pipe work are tight no vacuum leaks even make sure dipstick is fitted all the way and oil cap is well on, the hot cranking problem seems like lazy starter motor especially if no heat shield fitted,

Dave,