1995 850 2.5 l estate engine runs poorly

[fr64vr]

Hello,
Since English isnt my native tongue i wil try to write as correctly as i can.
Last week my car suddently started to stammer when driving and activate throttle.
First i tought it would be sparkplugs because few months back had simular problem and i renewed them (very cheap ones) then problem was gone.
went to my local garage
so now they renewed sparkplugs for correct ones. no result.
renewed rotor and distrubitor cap no result
checked wires to sparkpugs seems to be ok no wear or tear.
they added some fuelsystem cleaner bin driving about 300 km no result.
did check my self the air inlet filter this is in need for replacement.
found on the net how to read out diagnostic unit A portnr 2 says 111 (no problems)and port nr6 there is no connection possibility.
If someone has some usefull tips to help me with this problem that would be great.

further I wanna wish you all a happy newyear
gr Frank.

[Ozark Lee]

When you replaced the spark plugs did you set the gap? The gap between the anode and the electrode should be about 0.028" or about .7 mm. Many spark plugs come out of the box with a gap nearly twice as large as it should be and the Volvo engines are very picky about the spark plug gap.

...Lee