Possible misfire?

[SFD213]

Feels like my 5.7 is misfiring. 55-60mph in OD when trying to accelerate slightly. Not a lot but feels like a bucking sensation, or a misfire under high load at low rpm. Sound like something common? No cel


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[Hemi44]

I had same problem which turned out to be a misfire. How long has it been since you had tune up?

 

[SFD213]

I had same problem which turned out to be a misfire. How long has it been since you had tune up?

Been somewhere around 30k. Not sure brand or type plugs that went in or if they did the wires then. Just bought the truck at that time. I was pretty young and naive to know what I was doing


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[sngehl01]

Costs nothing to pull the plugs and inspect them.

You said you were young and naive, did you properly gap the plugs? If they were improperly gapped + built up crud over time or deteriorated over time you could have a bad plug.

Even if plugs are pre-gapped, I would always check them with a gapper.

If no CEL light on, that's the first thing I'd check.

 

[SFD213]

Costs nothing to pull the plugs and inspect them.

You said you were young and naive, did you properly gap the plugs? If they were improperly gapped + built up crud over time or deteriorated over time you could have a bad plug.

Even if plugs are pre-gapped, I would always check them with a gapper.

If no CEL light on, that's the first thing I'd check.

Lol I didn’t do the work, a “trusted” mechanic did. I’ve since decided he’s quite crap at his job so an improperly gapped plug is probable. I’ll be checking them first


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[sngehl01]

Lol I didn’t do the work, a “trusted” mechanic did. I’ve since decided he’s quite crap at his job so an improperly gapped plug is probable. I’ll be checking them first


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Gotcha! Read like you did. Yeah, give that a whirl and see what happens. New plugs are cheap, so I'd just replace em while I'm at it. Hope it clears up for you.

 

[SFD213]

Gotcha! Read like you did. Yeah, give that a whirl and see what happens. New plugs are cheap, so I'd just replace em while I'm at it. Hope it clears up for you.

Yeah I might just replace em anyways


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[Hemi44]

Not a bad idea to check the coils too.

 

[SFD213]

Whelp, good news and bad news. Good news: I know what’s wrong. Bad news: constant misfiring in cylinder 7. P0307 and p0157 came up. Miss in 7 and low voltage for bank 2 downstream o2 sensor. Had the 02 code previously but now getting the miss. Gonna take the plug out and diagnose tomorrow


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