ST185 GT-Four running in vac. HELP ME!

[GT4 Bourkey]

I have a 1993 Jap spec 3S-GTE in my 1990 ST185.
Last week it died & I got it towed.
Yesterday I thought I'd sus it out & put in the coil from a ST184 Celica.
It works but the engine will only run at around -10PSI (always in vac anyways).

Could it be the coil or does anyone else know what it could be?
I'm not sure & haven't tested them to see if they're different specs.

There are no error codes & I'm lost at the moment.

[Supersprynt]

Well that coil won't run the car properly and it sounds like you have a massive boost leak.

[GT4 Bourkey]

No leak. Sounds like it's in "limp" mode for some reason.
Might be another fault somewhere.
Just bought another coil & dizzy off ebay. Will try that.