2001 S60 Turbo

Car would not go over 15 mph and engine would not rev over about 3k. Fuel pump change a few years ago due to recall. Mass flow sensor changed about a year ago.

Have been having problemss starting engine if car sits for more thann about 10 hours or so.

Any ideas? Thanks

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Seems like you got some of the essentials for an engine to run out of wack, whether it be air, fuel, spark or compression I do not know. You will have to do a lot of looking to see what kind of data you can see on the scanner. What fuel trims your car is reporting, any air leaks, fuel leaks? Wouldn't hurt to take it to a good shop for a diag if you are unsure yourself. If it's running like that it will definitely have some sort of code, whether it tripped the CEL or not.