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under the assumption that the oil level is correct. you probly have a bad oil pressure sensor. when the car is cold the oil is thicker giving it more pressure when it warm it thins and has less pressure. Now assuming the oil level is correct you probly need to change the oil pressure switch/sensor
My Intrepid Did The Same Thing When Warm My Engines RPM Drops Down To 500 Which Is Too Low Have Someone You Know adjust The RPM's To About 700 Or 800 Rpm While The Car Is Warm & In Drive With Your Foot Firmly On The Brake While You Do This Operation Should Take Care Of The Problem It Did Mine
well the starting problem,start by checking the fuelpump,if it spins and doesnt start, but if you turn the key to start and it does nothing then take look at the starter, use a test light have someone hold the key in the crank position and test for power at the small wire at the starter if theres power and engine isnt spinning then replace the starter, the trany, i would start by first checking the fluid level, make sure engine is warm, with car at idle in park check level if the oil level is full in the trany then i would say its time for a trany shop to look at it, these cars have lots of trany problems. good luck.
if your car has the 2.7 litre you have to change the oil every 5oookm or 3000 miles and use the exact grade as per the book.
the 2.7 has small oil galleries.
you have low oil pressure and or idle speed.check the rpm and it should be 700 unloaded at warm temp.if the iac controller is bad and there is low idle,really low rpm could trigger the oil light to come on and the transmission vacuum controls will be causing strange behavior.
Major issues with the 2.7L motor. design flaw causes oil to hang in the heads and "cook" creating sludge. Sludge builds until the passage to the timing chain is blocked starving the chain and causing near instant failure...this is a "rattling" or Roulette wheel sound. The 2.7L is an "interference" type engine. When the chain breaks or jumps, the cams stop in position thus leaving the valves wherever they may land. The pistons keep on moving though....and kiss whatever valves happen to be open. Bye Bye Motor. Using Synthetic oil EARLY and exclusively cures the sludge issue. Replacing the timing chain and components at interval is crucial...don't wait for it to break or jump!
Don't delay on this. Take the vehicle in and have the oil pressure sensor checked. It could be just the sensor or it could be something more serious. A drop in oil pressure could lead to catastrophic engine failure.