Misfire - Cylinder 4 - Check Engine Light at 55-60 MPH acceration under load

[Squirrelsmith]

I get a multiple random missfire at freeway speeds and especially if towing every few months. Im ignoring it for now

 

[m002922]

New long block with all the same externals (plugs, wires, tune, etc.) solved my issue - so it had to be something with the block.
I'm guessing it was the valve issue mentioned earlier in this thread.

Eventually I'll pull the head to look at the #4 valve issues - but I'm guessing that was it.

Nothing was obvious from watching the engine run (#4) with the valve cover off - not a wiped cam lobe or anything- so not sure what I'll find.

Sent from my SM-G960U using Tapatalk

 

[socal k1500]

New long block with all the same externals (plugs, wires, tune, etc.) solved my issue - so it had to be something with the block.
I'm guessing it was the valve issue mentioned earlier in this thread.

Eventually I'll pull the head to look at the #4 valve issues - but I'm guessing that was it.

Nothing was obvious from watching the engine run (#4) with the valve cover off - not a wiped cam lobe or anything- so not sure what I'll find.

Sent from my SM-G960U using Tapatalk

not to revive a very old thread but did you end up figuring this out? i have the exact same issue.