Major engine or transmission problems, '90 Pontiac Grand Am

1990 Pontiac Grand Am; 2.5 Liter L4 engine w/fuel injection, automatic lockup, EFI, and balance shafts; 3-speed automatic transmission; 111,245.1 mi. (Approx.)
I'm driving down the road and my car starts to shutter in low 2nd and low 3rd gear. Then the "CHECK ENGINE SOON" light comes and the car makes a loud, sqwealing, whining noise and then dies. I pull the car over to the side of the road and try to start it. All it does then is the starter engages, and the engine jumps. I've had people tell me that it could be a few dropped valves, a broken timing chain, a thrown rod or main bearing, my torque converter could have went out, I may have broken the crankshaft, or I just need the engine rebuilt. I would like to know what it might be and hoow much it might cost.