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Gonna have to go to the fuse panel first, this is really bad, I have seen a few 944s require a ton of wiring from a short out on the chassis. If the fuses check out then you are going to need to take a multimeter and try getting continuity from some of the switches and sensors. but it looks like the wire going ot the fuel injection could be fried.
944s' are a breed all their own. It could be battery, battery cables and highly suspect relays (box behind driv. headlight) If you don't have test equipment, I'd advise having a reputable shop or dealer look at it. They'll be able to find your problem almost instantly after tests and that's a whole lot easier and cheaper than throwing parts at it chasing the problem. Sorry, wish it was easier.
Take off the rubber intake boot between the air filter & the Mass air flow sensor.Take a screwdriver and open the air door in the Sensor. This will activate the fuel pump when the ign key is turned to the on position. Do you hear the fuel pump? If not check the fuel pump fuse and relay over the drivers left leg area. You may have to bypass the relay by connecting the #30 post with the #87 post. If no results, bad pump.
Timing belts on 944s NEED to be changed every 30k miles. It can be a challenging job. I would recommend a shop. Balance belts, rollers and usually a water pump replacement is recommended at the same time. Cost, approximately $1400. Parts can be purchased cheap, but labor is 8-9 hrs. If you decide to do it yourself you will need a specific timing belt tensioner gauge tool. Good luck