suddenly it stalls while driving

The engine runs perfect when suddenly it stalls while driving. When i restart the engine it wont keep idle running unntil i push the troottle down up to 4500 revs then i runs corrctlecly again for a while.

Look at your fuel system first, when it dies, check to see if you have fuel pressure at the valve on the fuel rail. Then look at your ignition, see if you have spark.