Have a 2002 Ford Ranger with a 3.0 non flex fuel. Recently put a Jasper engine in due to low compression. Ever since install of new motor truck has run rough and very rich. Does not have any codes and can not run long enough to drive to try and get codes to occur. Appears to be running rich on both banks. Replaced all sensors during install except b1s1 oxygen sensor as it appeared new. Any ideas are appreciated.