'93 serena 2ltr petrol non starter
 

hi, have just rebuilt top end of engine after overheating.Engine ran fine for 5 mins then died. If I crank the engine it runs for 3 seconds and dies. Cranking the engine immedietaly after dying there is no spark at plug leads. If left for 10 mins will run for 3 seconds etc..then back to square one....distributor (cam sensor) is pulsing ok
coil and amp module and ign resistor(which is really a capacitor) is ok...plenty fuel/good pressure...have tried for two weeks to get this car running......help !!!