Hi, I have a 91/940 with B204E engine, recently self made converted to
catalysed by adding a Lambda Sond using pre-wired connectors and
replacing the air mass meter and ecu with a B234F one.
I have the car from about 3 years, and always misfire.
In the past I have tryed to replace the sparkplugs, ht cables,
distributor cap and rotary contact, all original Volvo, and ht coil and
power stage with second hand ones.
recently I have also completely revised engine head and valves, but
little misfiring continue.
I do not know more where to crash my head :-)

any help is appreciated.

thanks.

Paolo.