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My non turbo 1992 740 wagon has an uneven idle. The idle is normal and then for no reason it drops to 500 or 600 rpm for a few seconds then floats back to normal then it drops again. There is no apparent pattertn to this condition. The car has 145,000 miles on it and runs like a top with the exception of this annoying problem
I have done the following to the car already:
Oil & filter change
Cleaned the flame trap and all lines and fittings connecting to it.
Cleaned the idle control valve
New plugs, wires, cap & rotar
Added STP to the gas. (OK stop laughing!)
The previous owner had the injectors cleaned about 20,000 miles ago
I am new to Volvos so any help would be greatly appreciated.
Thanks,
Ken
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