[klnaco]

I very much appreciate the insights and help so far, but I could really use a little more right now to get this resolved.

I bought some carb cleaner and attempted to spray it into the intake manifold and there were no leaks I could see.

The car is still showing the P0302 and P0305 codes.

I have the plugs to replace the ones in the car and would buy the wires too but I'm not too comfortable right now understanding how to get at the rear 3 plugs and wires. I would appear I need to remove the intake manifold, DPFEE sensor and some other items to get at the rear plugs and to replace the wires, but I'm not sure how involved this is. I stopped in and read through a Haynes manual at an Advance Auto yesterday and thought the descriptions and pictures were really lacking and unclear. They did say the 2001 DOHC engines does not have sparks plug wires, rather they have individual coils.

I called around to a few shops and some wouldn't even consider replacing the plugs and wires and the ones that did wanted over $500! The Haynes manual indicated that if the car backfires at all it could be the EGR system (IE Valve, DPFEE Sensor, etc.)

I have to get this beast back on the road and can't afford to take this in for thousands of dollars worth of repairs. I personally have an issue with having to pay that much to have a tune up done. Does anyone have any more advice? Can anyone send along the shop manual to replace the plugs/wires?