944 wont start
 

replaced the dme relay with a spare brand new one i keep in my glove box because in the last 2 years i have been through 2 of them, the tach bounces on initial crank but not consistently, any ideas?

just a little more information i forgot to add, for a week adding up to the no start it would fire up for a brief moment and die, then it would start just fine, any advice or tests would be greatly appreciated, thanks

i just tried to start it again, first attempt it fired for a brief moment and died just as it was doing prior to it not starting???? second attempt it just cranked and cranked and cranked with no signs of starting????