crx si 91

ok i,am driven slow in 2nd then i hear a pop pop and and car stops run does any one know what might be the problem ?? when i go to start it sounds like its going to turn over then i get a pop outing sound out the back , over i was drivein like 5 mins earlyer and i bottom out on sumthing not sure if that has anything to do with my problem , sum friends say i could of blowen a vaule and others say timebelt and sum say maybe fuel pump my engine only has like 50 000 kms on it

more info...does the car start back up? Does the motor turn or try to, normally? Any problems be4 we should know?