Lroy

I have a 1995 sti v2 that im having problems starting.i had a full engine rebuild and the car started first turn of the key i took the car back to the garage for the 1000 mile service and check and was told the car had low fuel pressure so had a new fuel pump and the injectors cleaned.When i got the car back it took at least 5 turns before it would fire and has not started propley since i took the car back 3 times twice they checked the injectors and seals the third time they replaced the injectors but said they could not find the cause. As soon as the car starts i can turn it off and then straight away it will start first turn but if i leave it half hour its back to at least 5 turns again. Has anybody had or no of this problem any help would be great