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Many things but you might start with a clogged catalytic converter.
You can't. The idle speed is controlled by the Engine Control Module or ECM.
On the headlights, open the hood and look at where they mount to the front Radiator support they are on it.
The coil on the relay should read about 70 ohms
185/70-R14
The recommended fuel for all Volvo 70 series is premium, 91 RON or better.
With an OBD2 code reader
Bellbottoms to Boogie Shoes The 70's - 2001 was released on: USA: 4 March 2001
Sales totaled $70 billion in 2001
Has recent work been performed?
on the side of the air filter housing
With an OBD2 code reader