Please Help!!! Ford 1996 Taurus filled oil, now engine light,&stalling problems

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HELP!1996ford taurus wagon. engine light after filled oil, and continual stalling (Post #1)
I am a newby and needing some help with our 1996 ford taurus wagon. We purchased it back in July of this year from a used car dealer. It's a good car, but it has some problems. We had noticed that everytime it get's to about half a tank full of gas, it stalls when trying to drive. It does it when we push on the gas, give it a few moments, and it straighten s out only to do it again after we come to another stop. We fill it up, and it seems to be fine till it gets to a half of a tan or lower again.

Now that's the first problem we have had. Here's the next one and it's wierd.

About a month ago it was low on oil. So my hubby be the oil in. It has a check engine light on, runs a little rough now, and of coarse it still stalls as well like always when it's half full. But the light blinks at times. no rhym in it, can't count it. Then at times it's just on.

We have been told we need to pay $55 to get any service shop who is able, to get the codes out. I just haven't been able to afford that, but do know we need to. I was hoping with car doctors as yourselves are, maybe you could all help in determining the illness by the symtoms.

AS well can anyone tell me how I may be able to convert the tape payer radio system into a cd player radio system, and where to go to find one, that won't tear apart the bubble like frame, and can we do it ourselves, or are there sensors under there and it's better to leave the risk alone?

Thank you