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Discussion Starter · #1 ·
Had a CEL on for misfire cyl 4. Replaced all 8 plugs and cyl 4 coil. Reset engine light. Been driving it a bit since then. Now in 4th gear ONLY the CEL flashes, shift to 5th and it goes away. I don’t know what the hell is going on. Weird. 2002 Mustang GT. 4.6 with SLP Long Tube Headers, Cats are welded in, SLP loud mouth cat back exhaust. Cold air intake. 3.73 gear swap.
 

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cant be a trans code if its a manual trans
 

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make sure cyl 4 and cyl 3 injector wires didnt get switched
 

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Flashing CEL is a misfire. Sounds like in 4th, it might be due to being a misfire at light load versus more load in 5th. Easy to plug the injectors back in wrong. Also easy to plug things back in, but not seat the connectors fully. If the stupid stuff is ruled out, time to chase light load engine misses (EGR, vacuum leaks, etc.).
 
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