i took the battery out of my astra coupe to put in my mk3 gsi as the Gsi battery had totally died.
got it running to temp, then swithce dit off and put the battery back in the coupe
the coupe now wont idle correctly at all and will stall.
took it for a spin and stalls every time i press the clutch and the revs drop.
i think i remember it doing this before
will it fix itself or do i have an issue?