Though, on second thought if what I said in the above post were true it would happen all day long, not just in the morning when the car is stone cold. In that case you might have a weak "warm up regulator". If this is the case the car will start fine after it warms up, but will be hard to start only when cold.

Again, a set of guages will help pin point the problem.

I still think you have low residual fuel pressure, and another cause of that could be a faulty check valve at the fuel pump in addition to leaky injectors or a bad fuel accumalator.