Rep Power: 0

had oil leak high in rear of engine could not really tell where.possibly head gasket or rear cam shaft seal.replaced cam shaft seals, head ,intake,exhaust,injector,valve cover gaskets.replace thermostat,timing belt,waterpump,and tensioner.engine starts but won't keep running.had existing cel and srs.cel comes and goes.fuel tank vac or eld codes.srs is usually something with drivers seatbelt,plastic bag,milk shake ,etc.
looking for advice on where to begin troubleshooting

 
Rep Power: 215

Did you leave anything unplugged? All vac lines back on? did you set the timing back correctly?