I have an 02 WRX that has an uppipe/downpipe/catback(no cats though)/bov/intercooler hoses and I have a hard time getting my car started after it sits for a little while. I seem to have to crank it for too long. I replaced the battery and the problem went away, but now it is back. It is worse when I park uphill so I think it might be fuel related. Anyone have any ideas?