1990 Volvo 780

Engine Performance problem
1990 Volvo 780 4 cyl Two Wheel Drive Automatic 131058 miles

i bought this car as a project and it did not run right when I bought it. I was told by a guy that works on a lot of these volvos that it was a bad computer so I changed it with a new one but it did not fix the problem. The car takes forever to start and when it does it runs extremely rich and when you give it gas it tries to flood out then when you let off the gas it will die. It idles around 250 rpms really rough. When you open the car wide open it woll get up to about 3000 rpms with misfires on the way and will die. I have to clean the plugs about every time I start it. Is it a bad sensor? I have also changed the maf sensor and it did not change anything.
September 18, 2010.

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