Are my exhaust valves suppose to operate at low rpm ie turning over or is there a clutch that operates them at high rpms/

you assumption is right
the pump is operating at idle as at full rpms and is controlled by pressure relief valves
When demand for pressure is low the valves will be partially opened and will operate when the pressure is reduced ( ram valve is moved)
Higher rpms maintain the pressure for faster ram operation
I would suggest that you have the system pressure tested by a service centre as it could be a malfunctioning valve (solenoid) or a failing pump

i cant get that slang, DIff , gears, clutch to jibe. 1990 wrangler YJ
what does DONE mean.?
front or rear diff axle new, new transmission? what?
1500 to 1800 rpm 15 is engine stalled, or rpm of oil tanker ship.

got a MANUAL stick or automatic slush pump gear box?
but is no way to answer. you.
its a hydromatic A/T. right>? AUTO?
if yes,it has.
no electronics then. so clean AFT/ levels per operators guide not guessing? hot?
stall test pass (ask)
line pressure tests pass
kick down cable not stuck
or if M/t do say so, mine is, 5 owned..

but we only have one word here, sluggish to work with,
so that can be :
1: engine weak? (low rpms in all gears, and low power)
2: Trans slips (or flares) High rpm and low power (slip)

which is it?, the rpm in each gear answers that.
the FSM shows the range of rpm for each gear. ever seen a real FSM book? factory service manual.

sounds like an exhaust restriction or a transmission problem causing your problem. check trans fluid level and condition. you can have a test done for the exhaust restriction by doing an exhaust backpressure test at idle and at 2,000 rpms. if this is good then have the transmission checked for a problem.

jump it direct to the starter you could have a bad cable loosing power threw it

DTC P0736 - Reverse incorrect gear ratio

The clutch pressure control (PC) solenoid 2 flows fluid to the 3-5-R clutch when commanded OFF and exhausts fluid when commanded ON. The clutch PC solenoid 2 regulates the transmission fluid pressure to the 3-5-R clutch. The transmission fluid pressure (TFP) switch 1 Opens (High) under fluid pressure and closes (Low) when no pressure is present. The transmission control module (TCM) calculates gear ratio based on data from the automatic transmission input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the known transmission gear ratio to a calculated gear ratio for each commanded gear.

Circuit/System Verification:
Operate the vehicle to induce a shift from second to third gear while observing TFP Switch 1. Perform this action 2 times. The TFP Switch 1 should change states from Low to High. If the TFP Switch does not change states and no other DTCs set, replace the control solenoid (w/body and TCM) valve assembly. If any other DTCs set, diagnose that DTC first.
Operate the vehicle to obtain sixth gear 2 times and then check for DTCs other than DTC P0736.If any other DTCs set, diagnose that DTC first. If no other DTC sets, continue on with diagnostics.
Operate the vehicle by shifting from Park to Reverse, then while in reverse, operate the vehicle with the calculated throttle position greater than 8% for 5 seconds, perform this maneuver a minimum of 3 times. If the DTC P0736 resets, go to Component Testing.

Component Testing:
Perform the line test procedure.
Inspect the check ball 5 for possible sticking or damage. If you found a concern with this check ball, repair the concern.
Inspect the shift select valve 3 for sticking or damage. If you found a concern with the shift select valve 3, repair or replace the valve or valve body.
Inspect the R-1 (Low and Reverse clutch) assembly for wear or damage. If you found a R-1 assembly concern, repair or replace the R-1 assembly as necessary.

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when the car is cold the comp turn on the idle valve to be 1500 rpm normal but 2000 rpm too high may be a leak of air into the intake

How is your clutch? Does it slip or drag when starting out? When you put it into 1st gear when starting out does the bike lunge forward? Hold it in first gear with the clutch in and rev the bike up. See if the bike wants to move forward with the clutch in.It sounds to me like your clutch isn't set right or getting worn out. Much easier to shift at low rpms on a clutch than high rpms. I hope this helps...

Check for stuck throttle plate. Check pcv hose that goes to the intake manifold. They get soft and leak, check while running.

Try the air filter first (make sure it's clean). The needle valve on your carb slider could be bent, or not seated correctly or just set wrong. If you have a power exhaust valve, it could be set wrong or malfunctioning as well. Good luck.

Check the exhaust manifold gasket. I have a 2003 SVT Focus I had a problem with it loping at low RPMs. I had a free flow exhaust system. When I bought a new exhaust manifold I replaced the gasket and the problem went away.