[RupertPupkin]

Originally Posted by sixty9fordkiller

without knowing the setup, running out of gas or weak valve springs would be my guess

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Originally Posted by Risingson05

If you have a scanner , you can run a data log and see what cylinder is. Miss firing up there . I ran into this on my truck after installing my ported heads .
Ended up being a coil pack . Easy test for the coil pack is move it from one cylinder to the other and see if that cylinder misfires if so there’s your answer..

It didn’t end there tho , I have hpt so my scanner showed me what cylinder but my injector duty cycle was at 114% at wot fuel pump was also on its way out . I was running meth at the time and so the afr wasn’t showing I was leaning out too much .. had to disconnect the meth so I could see what was really going on ..

Had to upgrade my injectors and replace my fuel pump . Retune and everything is running fine now ..

Also it could be a ground but that would show up in the scanner , like you Tb closing early at wot

Ground , spark , or fuel .. cane be tune cause you stated your car was running fine ..
could be easy as cloggged injector or bad coil pack .

Everything on my setup was brand new. Unfortunately I have no way of logging. I am bringing it to a new tuner this Monday, so hopefully he can figure out what’s up with all my issues.

Originally Posted by Silver14

Logs would be great to see.


How old is the fuel? Bad coil/plug/wire?

Plugs are new. Coils are stock, and wires are new.