I am not sure whether it is due to vacuum leak. I had replaced most of the igntiion components and it had not fixed it.
So, I want to fix this problem by making sure that there are no vacuum leaks, i did find two, so we shall see.
i also measured the voltage when I slowly push down on the mass flow sensor plate and there is quite a bit of play where the voltage does not change and then it changes.
Continue investigation.
Barry Shah