1993 Grand Marquis problems

I love this car but it is having some problems. Tho odometer stopped working several years ago at 164000 miles. It is sputtering and stalling at red lights and stop signs. I have to put it into nuterel and keep my accelarater pressed to keep it idoling. Also when I am going down the highway around 60 or 65 then let up on the gas it sputters a little. When I start to accel it makes a soung like a medal gurgle. Eveny now and then I get smoke from the exaust when I pull away from a stop. A couple of times I have taken it in to have someone look at it and they found no problems. I don’t want it to go so far that I end shelling out mega $$$$ to get it fixed. Does any one have any input?