I've decided to get off my butt and tune my wife's 89 Fj62. I changed plugs, wires, cap and rotor. I know jack about EFI engines give me an old F engine and I'm fine. How do I get to the valves so I can adjust them. I'm trying to get some more fuel efficiency and power out of the old girl. I'll also be replacing the oil pan gasket due to the po's bad gasket job when the bottom end was worked on. Please help me out I know I need to get FSM but school me none the less.