1993 ford probe gt.....plz help?

i recently bought a 1993 ford probe gt v6...when i crank the car the rpms go up to 1100 then idles down really low and vibrates like it wants to cut off and the battery gauge and oil gauge are below normal. but when i give it the gas the battery gauge and the oil gauge goes up to normal..? ok then when im driving down the road it starts cutting back and not wanting to go then itll catch and go....and the car shifts rough at 4500 rpms...and the overdrive off light keeps flashing on and off and ive tried to turn the overdrive back on and it wont turn on...sumbody please help this my only means of transportation....thank you