You have to be careful with removing stock airbox and adding cone filter right onto the MAF . If you look at the airbox on many vehicles (not sure on volvo 240 ) they many have air straighteners to keep down any turbulence as this will cause MAF to read wrong, there very sensitive .
As someone else noted adding (if you have room) a short pipe between the MAF and cone filter may help this out a bit.
Also make sure cone filter not getting blasted directly with air stream , if any comes into area where its located .
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