Checked for leaks with brake clean and soapy water to see if there are any air bubbles, and nothing.
Sprayed a bunch of Maf cleaner into the intake, enough that the car stalled but ran fine after I started it again.
Plugs, wires and coil are fine and uncorroded so not sure what it could be.
There does seem to be a very tiny stumble at idle, but am really unsure
Took the car for a drive and could not get it to stumble when the brake was applied