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after posting the symptoms here and on al.autos.volvo it was suggested that the timing belt could have slipped a tooth and that's why I checked/replaced that. I am no diagnostic expert so I was going by what more than one person suggested.
Don't worry, I have no intention of just replacing parts - don't want to throw my money away.
Cap & rotor aren't even a year old, I just took them off and they look fine - a little worn, but nothing outrageous looking. Don't know about wires they're Volvo bougicord (sp?) I kinda flexed and jiggled them all while the engine was running and noticed no difference.
Also disconnected Oxygen sensor and noticed no difference.
How would I know if I'm not running on all 4 cylinders?
Can I just pull the spark plug wires off the plugs while the engine is running?
thanks
Ian
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