Fox Fuel or spark issues?

I have 1991 mustang that got rebuilt and added a cam
Mechanic just said it was stage 2 cam thats all but anyway Ive recently been having an issue where sometimes after turning engine off it won't turn back on and will act as if there no gas but if i disconnect fuel pump it'll turn on normally and die since fuel pump is unplugged
Today April 3 2025 that happened at work and found out my mass sensor connector might've been lose or wires might be going bad since after that it ran fine

Also iac is disconnected since it revs to 3k Rpm when connected and car also loses power after driving for a while and starts bogging down and back fires from driving from a stop

could my mass sensor be causing all this?

Code connector is nowhere to be found so so cant get codes..

AeroCoupe said:

Diagnostic port should be over on the driver side in front of the brake booster and between the master cylinder and the inner fender. It’s there you just need to find it as without checking for codes you are chasing your tail.

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Yes i know where the connection is at but the wires aren't the correct ones seems that someone just put random wires to fill in the connection