Misfire Again!?

Ryan · Aug 1, 2026

I drove from NY to Bangor ME to close on a piece of property yesterday. The truck was absolutely fine in the cooler dryer weather up north . Right when I got back into lower Connecticut/Massachusetts where it 85-90° and humid as hell I got the famous check engine flash. It was ok all winter and just had a NYS inspection and that didn’t pick anything up either. The same issue last summer. I was doing about 90 on I95 this trip so I was pushing the engine pretty good and It’s a long drive. If traffic got jammed up and had to creep along it’s almost predictable. I could be very wrong but I don’t think it likes the Corsa cold air intake in warmer humid weather. I don’t remember it happening with stock air box. It just hit 55k miles so I’m going to bring it in for plugs and wires this week. Yes I could change them myself but it’s a pain in the ass and if something is wrong it’s under 100k mile warranty anyway. I have a lot more trips coming up and one with a 14’ trailer and don’t want any major issues or cause any damage.

Stormin08 · Aug 3, 2026

what were your coolant temps ? i just ran a 2K mile ish road trip and on long pulls, easily saw 216...truck didnt missed a beat at hose temps.
i didnt like seeing that, but it ran fine and no knocking...i have a 6.2, running 91-93 99% of the time...but i also carry Madditive in the event i can only source 87-89

Ryan · Aug 3, 2026

I have the 5.3 and usually run sea-foam in the oil for the last 200 miles of an oil change and always run it in the fuel especially if it’s a long drive and I’m not sure where I’ll be stopping for fuel. Also did an oil change right before the trip and only run Amz-oil 0w-20. It actually gets me a couple extra miles per gallon. As per engine temp, oil pressure, voltage it was within or at least the normal parameters and nothing jumped out at me. As I said it’s almost predictable during especially humid weather. If I take it easy and run without the A/C compressor on for a few minutes it goes away.

Stormin08 · Aug 4, 2026

i only want to say this...NEVER ADD anything to your oil...research, call and spec out the oil you need. you do not want to dilute, modify or change chemistry of your oil. You may never see the end result, but that is high frowned upon.

fuel additives...you have way more room to play.

Ryan · Aug 4, 2026

Stormin08 said:
i only want to say this...NEVER ADD anything to your oil...research, call and spec out the oil you need. you do not want to dilute, modify or change chemistry of your oil. You may never see the end result, but that is high frowned upon.

fuel additives...you have way more room to play.

I only run Amsoil 0w-20 per spec. I’ve been running 2 ounces of sea foam per quart for the last couple hundred miles of every few oil changes in every vehicle Ive owned for as long as I can remember and it definitely works. It’s not frowned upon it’s pretty common practice. I do the same in my skidoo sled and in the performance motor sorts shop I used to work at. I even know some guys that even run diesel through the oil pan after it’s drained especially after long intervals between oil changes. I’ve done that through my Toro 5900. It’s never been an issue. It’s not an “octane booster” or gimmicky product. It’s one of the best cleaning agents on the market.