Ok so I didn't keep up with my last threads but has anyone found a solution to there no power while driving issues??? If so tell me what ya found so I can fix this truck!!! 02 extended cab 5.4L with CAI, TBS, high flow cats with flowmaster exhaust dumped... Just put a brand new clutch fan on helped some but still doggin around after engine heats up???? Help guys

 

Check the battery.. That's about all I can think of without looking at it

 

I would try and disconnect the negative for ten seconds and then reconnect and try it. That can cause the computer to restart sometimes.
If not check all plugs and coils maybe?

 

check engine light on?

 

No cels and no freeze frame data at all just runs like s^*t!!! I used to be a tech and this really blowing my mind!!!

 

It almost feels like a fuel delivery prob but hasn't had any normal fuel pump symptoms, fuel pressures only around 34psi at idle I changed the FPR and got up to 36psi heard it should be around 40 or so but no where close to that!!! If it's not fuel pump I'm thinking either a bad cylinder only prob is I have to patched spark plug threads in the back so very nervous about pulling those plugs back out again to do a pressure test