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A bad pressure regulator will allow too much fuel and in some cases over pressure the injectors so they do not open.
Ignition system can be compromised by old wires, rotor and cap. Usually not so temp related. Replace with stock. You can replace just the wires with a little work. Cheaper than the cost of a full set.
Vacuum leaks can cause problems. Check the rubber boot between the AFS and the throttle body for cracks and not seating. Even the small diameter tubing that controls the fuel pressure regulator and damper can have cracks in both the rubber fittings and the tubing. Also seen the intake manifold being loose at one of the runners. Usually due to a stripped bolt.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Never break more than you fix!
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