I have a '93 4runner V6 4x4 w/ 163k miles and it has been a champ! Just recently it has lacked in power (just a tad.. but noticeable) going up hill and on the freeway. It also began to miss fire when it runs around 2000 rpms. I changed the cap and rotor along with the plugs and plug wires. I started it up and it ran great... no miss fire. But when I put it in gear for a test drive its started to shake a little bit and had a huge lack of power (about had to floor it to get up my driveway). Im stumped. If anyone could please help I would appreciate it. Thanks