i drove from my house to the store (3 miles) and on the way back, the car just shuts off....everything else works, headlights, horn..etc...then I turn the key and it cranks rapidly fast....so i got it towed home and i checked the timing belt , balance shaft belt and the timing and they were all good, i even reset it to TDC..took off the vavle cover and cranked it and all the valves are moving..so..I check for fuel, and its there and i check for spark and I'm also getting it...I replace the plugs and still it cranks rapidly fast...i did a compression test and all the cyclinders were at 50psi............so does that mean a new motor..???

 

that is low compression

 

did you try starter fluid