S280 fluctuating idle speed
I have a 1994/5 S280 which has developed a problem at idling with fluctuations between 600rpm and 2000rpm. Also if try to rev too quickly it backfires and pops. Car runs fine however once over 2000 revs. Pulling away seems to choke it up but if gentle on throttle it will crawl until engine picks up.
Someone suggested an air leak, but cannot locate anything.