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oil is new and full,during idle oilpressure drops and engine idles rough, stalls on 1992 Buick Roadmaster

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at, speed runs well, just during idle, oilpressure drops, engine idles rough and stalls.
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Thanks for your help,Globalhelper, I just purchased this Buick. I need to know the true condition of the engine,if there was odometer tampering,is there an engine diagnostic that will tell me the true state of engine health? I don't want to just start changing out parts on a wild goose chase...this oil pressure issue could mean an engine overhaul and this is frightening.What is the cost of diagnostic? If engine needs overhaul, what is that going to cost?
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take it and get a compression test and leak down test to determine the condition of the motor and ask alot of questions prior to getting diag. ask for oil pressure test a motor could cost upwards of 3500.00
My 1992 Buick Roadmaster Estate wagon has 50,000miles, has a slight idle tremor while stopped.At first it would idle under 500 rpm's and the oil pressure would drop below 20, then eventually stall, while I had my foot on the brake. If I placed in neutral the idle would be a bit better, but could still feel the tremor. I replaced old sparks with new, the tremor is better but noticeable.Could it be the timing chain?, what is the cost of repair?
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