Fast idle, stumble on acceleration
I recently bought a 1987 560 SL with no idea of its service history. It insists on idling at 900-1,000 RPM, and stumbles on acceleration. Also, when I pump the brake pedal, the idle surges upward slightly. I've searched the archives, but don't feel like just randomly replacing parts. It sounds like a combination of things (idle control unit, plugs wires, etc.) Any thoughts?
Max J. Sandler
1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.