misfire/hesistation/poor accerlation after highway drive?? HELP

alkaspeltzar · June 22, 2017

2014 Silverado, 3.42 gears, 5.3L, 75K miles

Truck has all the current maintenance. Even recently had throttle body cleaned and relearned, MAF replaced, air filter new, and fuel induction treatment

Notice after hard drive pulling or spirited drive on the freeway, when I exit the highway on off ramp, say sitting at a red light, when I take off the truck makes it thru first gear smooth, but literally falls flat in 2nd or 3rd. Feels like a misfire, or lack of fuel, or something.

odd thing is, power thru it, next stop light, no issues, drives fine. Dealer cannot replicate, no one has any ideas. Been to 3 dealers and they are all stumped.

Any ideas guys? Thank you

PS: I know the trucks can be laggy with the Torque and fuel management system, but this behavior is new within the last 15K

Justin101714 · June 22, 2017

When it has this misfire feeling condition, do you o is if the engine is actually stumbling? Or does it feel like it just doesn't want to go?

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Bxnanaz · June 22, 2017

If it were me, I'd start with replacing the plugs.

alkaspeltzar · June 23, 2017

It feels like it just doesn't want to go. I have not gotten a check engine light or anything. Just like it wont give me power, pressing on the pedal I can see the tach bounce like it is lugging. eventually it cleans up.

It is hard to duplicate, but most noticeable when turning after being stopped on exit ramp of freeway....like it is lean or whats to run lean and doesn't realize I am commanding power.

could it be torque management just interfering at specific points? if so, why am I noticing it more now.

Edited June 23, 2017 by alkaspeltzar

drentlaw1 · June 23, 2017

I got a misfire yesterday and was running like crap, then the check engine light came on and started flashing. Turned out to be a loose plug wire. Probably happened when I put my headers on I didn't get it set good enough and vibrated loose. I'd check plug wires and with 75k might not hurt to do spark plugs while your at it. It's weird that there's no check engine light though.

Vonzip · January 2, 2019

Install a new ground from the free/available bolt on alternator bracket to the groundstrap on firewall.Clean main fuse connections on firewall.A bad ground causes all kinds of problems with the computer and associated modules/system.

dbrobins27 · January 2, 2019

On 6/22/2017 at 9:28 AM, alkaspeltzar said:

2014 Silverado, 3.42 gears, 5.3L, 75K miles

Truck has all the current maintenance. Even recently had throttle body cleaned and relearned, MAF replaced, air filter new, and fuel induction treatment

Notice after hard drive pulling or spirited drive on the freeway, when I exit the highway on off ramp, say sitting at a red light, when I take off the truck makes it thru first gear smooth, but literally falls flat in 2nd or 3rd. Feels like a misfire, or lack of fuel, or something.

odd thing is, power thru it, next stop light, no issues, drives fine. Dealer cannot replicate, no one has any ideas. Been to 3 dealers and they are all stumped.

Any ideas guys? Thank you

PS: I know the trucks can be laggy with the Torque and fuel management system, but this behavior is new within the last 15K

Id like to follow along as well as I have been having the exact same issue. When I get off of the highway from my daily commute that first acceleration away from the stop light it pretty much bogs down in second gear for a few seconds then picks up. I have noticed that if the ramp is backed up and I have a few stop an go cycles before getting through the light then all is fine.