I,m new here hoping for some answers. My 06 Ranger 700EFI will not accelerate. Idle is ok but rough. Plugs were fouled black but new plugs did not help TPS was replace five years ago. Injectors were checked and cleaned a year ago. Fuel pressure is about 36PSI and holds constant on acceleration. When I try to accelerate it bogs and pops back through the intake. Blink codes are 21 and 61 . My book does not show a code 61. Any thoughts will help.