1994 Nissan Hardbody limited rpms when warm

Question edited for a lot more clarity.
Question moved to model category.

All the parts are shown here and there are thumbnail diagrams you can expand.

https://www.nissanpartsdeal.com/oem-nissan-hardbody_pickup_d21-vapor_canister.html

More here and on the images tab.

https://www.google.com/search?q=1994+D21+4+cylinder+EVAP+parts+diagram

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NO control told or miles on engine (KM) odometer.
what is a hardbody, a Pickup , not in USA are you? no country told

SO YOU POST TO THE BLIND AND DEAF THIS.?
why not ask a live hands on service tech to check it out and not blow up a still good engine, why NOT?

yes the pickup truck hardbody means double wall bed.
my guess engine is 2.4L 4-cylinder KA24E
a specific engine that.
KA24DE 2003.
the DOHC<? twin cam is buckets over valves cam direct via CHAIN those are bucket lifters only, and only make noise if it sucks a valve.
ever, oKay
the chains can fail 200k miles, or KM equiv.
if you allow most DOHC chains or belts to fail the engine valves are bent over and worse.
so learn to get that checked out and not ask the deaf ever.
do not delay , IMO ID not drive, it at all , or go to the mech shop now. no delays.

Question edited for typos.

These are the D21 wiring details. The best way is to get a conversion harness D21 to JVS from Crutchfield.

1994 Nissan Hardbody Pickup Stereo Wiring - The12Volt

https://www.the12volt.com > installbay > stereodetail
1994 Nissan Hardbody Pickup car stereo wire colors, functions, and locations.

Nissan Hardbody radio wiring colors

https://forums.nicoclub.com > ... > Nissan Trucks Forum
Mar 5, 2011 - have rear wires i ran my own but this was schematic for after market plug to harness so colors should be right unless back are missing and ..

Sounds like clutch is slipping. If you accelerate and it does not respond I would say clutch assembly is bad.

you need to get your tires balance.

When it doesn't start, check for spark from the coil.

the egr valve could be sticking causing this issue put a vacuum gauge on the egr valve to draw a vacuum then release it to see if it sticks

possibly a spark plug wire loose or plugs need replacing?

The EGR valve sticking, loose wires, bad ground connections, dirty connections, fuel pressure dropping out, vacuum leaks, or any combination of several of these at about the same time.

your too high in the gears when you are trying to climb a hill.