Hesitation off idle

Im working on a 90 sc with 52,000miles. Its been in storage for 4-5yrs. It was started once a month

I flushed the fuel system. Drove it and it stalled when you go from park to gear. I also noticed there is a big hesitation from idle to snap throttle. I put a few miles on it and it seems to be getting better from park to gear but the hesitation is still there.

Started going through and servicing items.
Plugs
Wires
Fuel Filter
Injector flush
Removed air silencer
Pulled Supercharger and resealed tubes
Checked vac lines.
Clean Maf

Even after this the hesitation is still there. visually it all looks and sounds good just have the one problem.

Any ideas

Doug

Still having this issue.

I have drove the car with a fuel pressure gauge and it is 32psi at idle and gets close to 50psi under full boost

Cleaned the tbody

I checked tps voltage key on engine off
voltage 1.033,
wot 4.66

Used a scanner and no codes are present.

Car is completely stock
running 18-19 vac

Any input would be helpful