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why wont my 84 944 start when I have spark, fuel, correct timing, and compression.

  • 1984
  • 944
74 000

I just swapped a 84 944 auto 3 speed to a manual and it started up once for a min. i shut it off and tried starting it and it wouldnt crank. I narrowed that down to a bad ground. But now that it cranks the engine wont start. The reference sensors are new. I re soldered the dme relay. I changed the igniton switch. I have 12 v to both sides of the coil. But when im cranking it over the test light dims alot. And right when im letting off the key it fires and then stops. Im confused.

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