I'd try the easy fixes first,
Fuel filter - assuming its inline,
Clean the throttle body- Pop off airbox, spray cleaner in, wipe down best you can, take for a good drive,
Check plugs, - see if there is any arcing on the wires, or plugs.
Toss a bottle of injector cleaner in a tank of gas.
Are the injectors direct on this puppy or no?
LOVE old volvos box looks.
Fuel filter - assuming its inline,
Clean the throttle body- Pop off airbox, spray cleaner in, wipe down best you can, take for a good drive,
Check plugs, - see if there is any arcing on the wires, or plugs.
Toss a bottle of injector cleaner in a tank of gas.
Are the injectors direct on this puppy or no?
LOVE old volvos box looks.

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