1994 Ford Thunderbird Acceleration, Jurking and a few othe

1994 Ford Thunderbird Automatic 132, 00 miles

I just recently was given a 94 thunderbird from my fiances uncle, the car had been sitting for 3 years so we knew it had to have some repairs, when you would start up the car the low coolant light would come on for a minute then shut off, so the next morning after driving it home, we went and got a tune up oil change and fuel and air filter changed it seem to run better except it jurked a little when driving even at low speeds, the next day we got the transmission flushed, and then took it on the highway it started to have trouble accelerating and if I would let off the gas a little it would jurk a bit. Now when we turn on the car after it has been sitting all night the low coolant light comes back on but turns off after like 30 seconds. While I sit there and let the car warm up it seems to rev a little then go back down then a minute later rev and go back down again.

Also the heater will go from hot to cold every so often. Please help! Thank you!