2005 Nissan X-terra

My car starting having problems accelerating and would not go over 20 mph. At some points it could barely accelerate at all, and the car barely made it to the shop before breaking down. Took it to a mechanic who told me I need to have all the spark plugs replaced and the catalytic converter. Totaling in about $1,400 dollars in repairs.

I’m planning on buying a new car, and just want to trade in my X-terra. I’ve been told by friends that you don’t necessarily need a catalytic converter to have the car run. What are the minimal repairs that could be done in order to just get my car running ? I plan on just driving directly over to the dealership. Is it possible to just have the spark plugs replaced and leave the catalytic converter as is? Would this be sufficient?

Please HELP!
-Karyna Romo xttera