Idle problem with a/c on

[FiveOfastback]

Besides my 67 I have an 88 GT 5 speed all stock. I have an idle problem with A/c on after throttle is blipped wants to stall or will stall. Adjusted idle up slightly TPS is set to .97 volts Cleaned Iac new air filter. Did some checks for vacuum leaks not very thoroughly though. The car has sat till recently for 3 years. I replaced the fuel pump filter, fuel regualtor and #1 injector(do to crack in tip).
I need some advice from the FI experts as I am a newbie to injection. BTW this a speed density car.
HELP!

 

[HISSIN50]

Did you set the idle with the IAC disconnected? That helps some folks.

a SD motor should pull nearly 20" hg of vac at idle. The vac signal is critical to proper operation, so it is worth testing IMHO.

A Mitivac is useful for testing vac lines.

No codes (SD cars have no functional CEL).
Good luck.