Volvo Engine Trouble

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Dec 22, 2006
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#1
I keep getting the following codes on my non turbocharged 97 Volvo 850 V01002-MAF or VAF circuit low input; P0440- Evap emission control malfunction; B0300 Random Cylinder misfire; P0172- Sys too rich Bank 1.
I have changed plugs, wires Distributor cap & rotor. Idles rough initially but smooths out in a couple of minutes. Any ideas?