Stand in front of the car and push down on the front to bounce the suspension. If it creaks, your ball joints are shot. Don't blame your Opti for everything. My 95 9c1 has 400,000 on the original opti with an MSD cap and rotor. Check the PS pump bearings as suggested, The exhaust manifold leak sound like knocking as well. Follow the other suggestions. Missing is most likely plugs and wires. Good luck.
'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.