Toyota Repair: 1998 Camry Misfires, denso plugs, vacuum leak

Question
All of a sudden, my 4-cyl 1998 Camry with 144,000 miles on it starts to rough idle, practically stall at stop lights and exhibits severe loss of power going up hills.  Once the car has momentum and is up to a decent speed, it it not as noticable.  I had the OBD Code checked and they told me it showed "misfires".  I have changed the oil, replaced the plugs with platinum tipped as specified, replaced the coil packs, replaced the PCV valve.  I have yet to replace the plug wires and EGR Valve.  I am leaning towards replacing the EGR based on others with a similar problem.  

Any insight/tips into a solution would help. I am trying to avoid the money pit to fix this.

Thanks,
Kevin


Answer
NGK/Denso plugs only regardless of construction.

Most probably it's a bad spark plug, a vacuum leak, or you've got a fuel supply problem. Be it an injector, pump, or otherwise.

*Which* misfire code was it storing? It'll normally tell you which bank misfired. & that's almost always a basic ignition problem.

Also keep in mind when you go replacing coil packs. This (most newer) engines are wasted-spark. That means one coil drives two cylinders. If a coil goes bad, you'll get a misfire on both cylinders. If you have a misfire on just one cylinder. The coil is fine. :)