streetwise cutting out when cold

rover streetwise 1.8 automatic when its cold and you start up and as soon as you put into D or R the revs drop and it stalls,if you restart and then rev it let it drop to idle then put in D it drops again but not enough to cut out,could it be throttle position sensor? it has also been crap on fuel,its had a new coolant temp sensor and does seem to be a bit better on fuel now but the stalling is a pain

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