When it's running, try unplugging the idle control valve. You should notice a big drop in rpm, almost to the point of stalling, say 400 rpm. If you notice little or no difference when you unplug it, you'll have found all or at least some of your problem.

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Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green

Dockside: 1968 Eltro 17
1985 Silverton 34C