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Pls help P0300 issue

CYKO50

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Wassup everyone, I’m new to this site and been told this is the best mustang advise you can get on the web. I appreciate everyone’s input and want to give thanks in advance.

well problem is I just picked up a 15 GT and did the 2018 manifold swap done by a local shop. The manifold has the lockouts with stock throttle body and 47# injectors along with new coils and new ngk iridium plugs. Also have a ngauge tuner with palm beach dyno doing my tune. Right now I just have a base tune and having trouble completing my tune. I sent in the idle/rev tune to my tuner then was told to drive normally for 5 min and log after that to do a wot log. Can’t do it due to the P0300 code was advised by my tuner to clear codes before I do the 5 min normal drive log and the wot log. Any advise where to start. Now I was also told to gap my plugs to .042 could this be the issue to the misfire? If not, pls any advise would be helpful and much appreciated. Aloha !!!
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bluebeastsrt

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The code is for a random misfire. Most likely caused by a vacuum leak.
 

My 1st GT

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Wassup everyone, I’m new to this site and been told this is the best mustang advise you can get on the web. I appreciate everyone’s input and want to give thanks in advance.

well problem is I just picked up a 15 GT and did the 2018 manifold swap done by a local shop. The manifold has the lockouts with stock throttle body and 47# injectors along with new coils and new ngk iridium plugs. Also have a ngauge tuner with palm beach dyno doing my tune. Right now I just have a base tune and having trouble completing my tune. I sent in the idle/rev tune to my tuner then was told to drive normally for 5 min and log after that to do a wot log. Can’t do it due to the P0300 code was advised by my tuner to clear codes before I do the 5 min normal drive log and the wot log. Any advise where to start. Now I was also told to gap my plugs to .042 could this be the issue to the misfire? If not, pls any advise would be helpful and much appreciated. Aloha !!!
Did you ever get this resolved? I also have p0300 code and not sure what to do.
 
 








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