1990 bone stock ka24e trouble starting up

[Philthese93]

Whats up guys. My damn ka (5 speed) is having trouble starting up and I think its the iacv? well here is my story

I replaced these parts with brand new parts from autozone fram fuel filter, dephi fuel pump, gp sorensen fuel pressure regulator, DIF iacv gasket (i cleaned the iacv with carb cleaner and let it air dry for 1 hour), ngk platinum spark plugs, ngk wires. I dont know what else it could be. The car idles between 800-1000. Doesn't idle steady it jumps up and down.

Today when leaving the car parked when i went inside the store it had trouble starting up again. The only place (i found so far, havent checked the dealer) that sells a new iacv is auto parts warehouse for 166 with a new gasket. Is there anything else i should check? starter is not the issue either, it was replaced by the previous owner with receipt from autozone (or is autozone the issue lol)

Another thing is the cars idle drops to 500 when coming to a stop. I coast in neutral and car drops to 500. down shift and car drops to 500. AND when I put the car in reverse it sometimes wants to die. The lights dim a bit, idle drops to 200 and then picks back up. Alternator maybe?

Thanks for reading