engine turning over, but won't start Options

[PolliS_5S-FE]

Hi guys, after driving for a bit today i stopped at the local autoshop for about 5 min then when i went to leave the car wouldnt start. the engine would turn over but not fire (didnt even work jumpstarting it. the exhaust made noise while rolling but there were no rev's).. then, after about 20 minutes of letting it sit for a bit it started with no problem.. then again when i got home it wouldnt start.. any idea's???? would be much appreciated

[PolliS_5S-FE]

thanks stwin, definatly something to look in to. everything is getting power tho (can sit there parked for ages with the radio on etc and have it start first time.) update. yesterday while driving home from work, it was running fine and the n i got to a round about after about 20 minutes of driving and the engine seemed to lose all life for a split second after taking off (nice n slow ofcourse) in first and then did a huge lurching bunnyhop, the C.E.L came on and then started to go again..

now, my main engine bearing has needed to be done for a while. Could this be the cause of all or atleast some of the problems..?

oh and yes, as far as i can tell im getting spark