Question about 1992 Lexus Sc 400

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Fine idle on startup can stall when warm

My sc400 is automatic and when it starts up when in park it is fine. If you put it in neutral it idles higher. Then in drive it goes back to normal. Now, if i leave the car to warmup for about 5mins. then it starts to stumble and idle roughly. I recently changed the ignition coils and replaced the spark plugs.
I believe that it may be the idle air control valve, but not sure. No codes, except for an oil pressure light, but the oil seems to be pumping up to the top fine. So back to the idle problem... when it's warm and stumbling on the idle... if i throw it into drive or reverse it stalls! If i give it some gas it will not stall. Please help!

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