I have a 1995 honda civic ex I did a b-16 p30 swap. My car missfires at full throttle but if I back off, it runs good without missfiring.It seems to only missfire at normal tempature if I full throttle it before normal temp it won't missfire.I tried everything no one can understand why it only missfires at normal temp and not at all times. E-mail if you think you know what the problem is at (civic95_SI@yahoo.com) .

 

Most likely it is fuel related.. you are running lean at WOT.. The reason it doesn't when the engine is cold is because the ECU adds extra fuel when the engine isn't up to operating temps.

 

did you try bringing your timing back a bit?

 

How can I fix it I think it sounds like it's not getting enough fuel I tried

 

Raise the fuel pressure.. whats it at now?