350 TBI - No Power When Towing?

[95k2500]

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These are the old plugs, finally got a chance to change them. Top 4 are from the driver's side, bottom 4 are from the passenger side. Look like pretty normal wear, a couple are a bit dirtier...

Thoughts?



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[Keepinitoldskool]

Couple of those look oil fouled. And a couple look like the cylinders may have been borderline hot

 

[SkyHighColorado]

Couple of those look oil fouled. And a couple look like the cylinders may have been borderline hot

I agree those don't look so good.

 

[IOWNJUNK]

I don't think any one of those plugs look "bad", but they certainly dont look consistant. Some look like they have 150k on them and a few look brand new. Might just be time for a tune up.

 

[95k2500]

Changed them all out and gapped at .035 ... today going to tackle the fuel filter. I've got fuel injector cleaner in the tank right now too. Took it for a good run last night and it definitely has a hesitation under hard throttle, once it's up around 2,500-3,000 rpm it seems to stutter when you push down the pedal. That behaviour is what is being magnified by the trailer when towing, so that's the mystery I need to solve.

 

[95k2500]

Towed the same fifth wheel this weekend and what a difference! New plugs & a bottle of injector cleaner were the only two items I knocked off the list and it towed the trailer great, even would shift into 3rd and still tug up the modest inclines.

Appreciate all the suggestions!


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