1991 Volvo 940 "runs rough" Questions

runs rough then clears up &runs great some time when driving the engine will start to surge & run rough & black smoke comes out the exhust i notice that the turbo gauge will bounce up and down if i ...

my car runs rough!! the car runs rough since i changed the fuel filter! is vehicle gas or diesel ?

...runs ruff changed plugs and wire checked timing and doesn't eem to have a vacum leak replaced fuel pump rrelay and wire that attaches to trans also replaced part next to air filter.can i chek engine ...

95 volvo 940 running rough 940 non turbo running on first two cyls,spark ok replaced ing module,tune-up, had ecu checked ok.fuel injectors swapped no change what am I missing Have you checked ...

95 volvo 940 (non turbo) wont start:( The car was running rough and lunging, so I used Gumout and then Techron injector cleaners and replaced the fuel filter. It ran well for a couple of days then one

...runs rough when it cold outside It can be issue with low fuel pressure,the fuel pump is getting old both needs to be checked.Also get the IAC valve checked.Go through the related help links with ...

...runs rough in overdrive car idles rough also runs rough in overdrive. Problem started after a oil change???? weird..Catalyst was stopped up had to punch a hole in it to get it to run. Took it to ...

...runs rough when started after sitting for several days. The car runs fine if I use it daily..if it sits for several days it starts ok, but runs rough, backfires, and smells like rotten eggs. If I ...

runs rough, after replace crank sensor car run rough, now don't run. car start runs rough, after replace crank sensor car run rough, now don't run. go through wireing near sensor and plug attached

...with engine warning light flashing the engine warning light came on and the engine started vibrating (running rough). the engine even vibrates (runs rough) when the car is at idle. what are the ...