87 TII, stock motor , emission control blocked off with high flow intake & exhaust upgraded.

Would there be any air flow improvement if S5 Air Flow Meter were use instead of S4.

Can an electrical connection modification be done to use S5 AFM?

I just had J-Spec motor installed and it has been running strong.

However, I would have to restart the car and tried to keep it running up to 5 restarts before it would idle on its own.

Then the car could be restart easily and idled smoothly @ 800 rpm.

If there were any vacuum leaked at the after market Blow Off Valve, could it cause the

difficulty in maintaining idle at first start?

Thank you