first off can i get some fenders off an 89 vert and put them on my 87 t2 are they compatible?

trying to get my recently aquired rx7 to work right so itll be the only car i drive
ITS THE DREAM AND IF I CAN GET ANY SORT OF HELP THAT'D BE GREAT

i have 87 t2 what happens with the car it did have vacuum leak and i always lost power when drove it, smoke tested and no more came out, but still lost power, after getting a new afm, starter, new spark plugs and fuel pump it starts up runs and drives like a champ for about 10 minutes idles at about 1.5rpm and eventually dies if i get it to idle at the normal amount at 1 or lower rpm it shakes the whole car
when i start it cold it tries to shut off unless i keep my foot on the gas then stays on by itself after a while
it doesnt have a stock FPR dont know where it came, got it like that (could be the problem??) could it be flooding or could it not get enough fuel( i do have to remove injector fuse sometimes) also sometimes has misfires

these images (if visible) show
-the current FPR the car came with
-boost gauge that does work, the one on the cluster doesnt move but seems to move when i try to start the car and doesnt start
-Boost control that was added and dont know if it even works or is on right
-missing parts below BAC where leak came, could be place for Air controlvalve for smog
-vacuum hose being split to different things

 

if anyone could give a bit of info or help itd be awesome

 

the moldings on the S5 Fenders will not line up correctly compared to the S4 Fenders.(at the Bumper).

As far as your mechanical situation,Who the hell knows what was actually done to the car without seeing it up close and your dilemma may be solved by bring it back to stock and seeing of the car will run correctly as stock.
Countless times you see aftermarket parts installed and not backed up with the other necessary parts to make everything run correctly.Top it off the part may have not even been installed correctly or even be compatable for the car.
As I say,you can't slap lipstick on a pig and pretend it is a "ten"...(then again,have you seen some of the Girls out there????.....makes me wanna date that Pig..lol!)

 

so then it seems i have to get it as stock as possible, alright then

also the last picture
should that vacuum hose be split up so much it goes to the fpr, the intake, the pressure sensor is that right or did the previous people didnt know what to do?