2002 Nissan Frontier Questions

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I have a 2002 Nissan Frontier with 3.3L V6 SUPERCHARGED engine that just
died... can I replace with a NON-supercharged engine? or where can I find the proper replacement engine.
NOT finding anything supercharged; mechanic told me that I cannot just use a "regular" engine to replace???
Please help!!!
PS I know nothing about vehicles!
I have replaced plugs, wires, new distributor, tps and still get rid of p0300 code. Engine light used to come on and off but now it just stays on. I noticed there is a bad exhaust smell now. I am planning to change out crank sensor and fuel filter as they are cheap to replace.
would it be sensor or computer i find no faulty wiring at all
So I gave her a tune up; new wires, cap, rotary button, oil, oil filter and fuel filter. What else an I do before I start bringing to a mechanic cause my worries are that it's the cats and I don't want it to mess up worse if I can fix something simple now, sugesstions?
I have all other gears but 4th. It also makes a bad whining noise. Any help would be great
I can reverse and drive in 1st and 2nd gear but will not engage in drive, when put in drive it just goes neutral hit the gas and is like I heave it in neutral?
but runs rough and then stalls
Thermostat not showing running hot.
I have been quoted around $1000+ for replacement of a part at two different shops (one was a Nissan dealership). The dealership gave me completely wrong information - they said the part was no longer available new and would have to be replaced with a used part (it is available), and the part # they gave me ended up being for a v6 and I have a v4. Another shop would never tell me the specific part they would be charging me $1000 for. I need to get my brakes fixed, and I have no idea where to go.
after all the fluids heat up the transmission seems to operate normally. Problem seems to be getting worse each day.
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