Coonper

Hi everyone I had a corrado vr6 years ago and loved it, so im going to buy another one, only this time its a golf. I have been offered a 1992 vr6 golf with 120,000 miles for £500 However, it has a missfire at low revs. It has been on the diagnostics and it said "idle air control regulation and engine speed sensor no signal." Could this cause the missfire? Any idea how much, and is it an easy fix? Thanks in advance