1991 Wrangler 2.5 L idle problem. In N, vehicle

4psi idle (bad) and revving to 3k does what, you didnt say.
what was idle RPM 800 or 400>?
the answer is different by hot and cold oil
and oil type, no type stated (do not say brands) 10w30?
running 0w are you>?
and is as low as 8psi hot. at idle ,that is if idle speed is at spec.
is it?
and 3000 rpm would be like 25psi hot, and more cold.
the max pressure will be the pump regulator value.

here is the sensor spec.

The sensor closes when the oil pressure drops to between 4-7 psi (28-48 kPa).

the oil type and bearings clearances (in total) dictate pressure.

3,1 CPC engine spec is.

Most carb. engines should idle between 725 and 750 R.P.M., lower the idle and be sure to check the timing. You should have an emissions label under the hood to explain the idle and timing.

It could be a combination of 2 things. A faulty MAP sensor itself or a bad TPS (throttle position sensor). It's not uncommon for a bad TPS to idle when the motor is cold but once warm, not idle fast enough to keep the vehicle running.

One thing you should get checked is the oil pressure.You could have an oil pump that is going out or getting weak.Also depending on how regular you are with your oil changes it is possible that you could have a sticky lifter.The oil pressure at idle should be 4 psi and 25-80 psi at 3k rpm.If it is less than 4 psi at idle do not do the 3k rpm.This is check with a warm engine.(normal operating temp).Hope this helps.Good luck.

I dont know the answer but my vx deluxe is doing the same thing. Not as bad as yours but 4k rpm idle.....ANyone?

The check gauges light is normal because at 400 rpm it isn't running fast enough to build sufficient oil pressure. I am guessing maybe a vaccum leak???

Try cleaning your throttle body, then disconnect the battery to clear the memory.

check maf and tps sensor

It appears the car may not be entering tuneup mode. warm up until temp is normal, idle stays below 1000 rpm
2000 rpm for 2 minutes
rev engine 2-3K three times
idle for one minute
turn off
disconnect tps
start
rev 2-3K three times
adjust timing

I've got Hyundai Lantra 1.6 year 2000. It's take time to start when it's hot. When I start my car it revs at about 2k-3k rpm. It also does it when I come to a stop. When I come to a stop it will stay at a higher rpm than that of idle speed. It drives ok when on freeway but uses more petrol. I have changed the water & petrol pump but no luck