Hey guys, new to the forum and hope im posting in the right area!

I had been having an issue with my truck where it would get massive fuel cut (bucking and hesitation) when in overdrive on the freeway, a slightly rough idle (would idle fine and have random hesitations, not consistent at all). Check engine light never came on so i did the usual; oil change, air filter, fuel filter, cleaned out the throttle body to no avail.

Now as of a couple days ago im getting terrible idle, and absolutely no power. feels like im driving a go kart! the service engine light came on for about an hr, then went off again.

Found a few websites that talked about not having to get a code reader and just jumping the terminals. im 99.9% sure i jumped the correct terminals but when i put the key in the on position the service engine light just flashes once then stays on.

the only other thing i can think of is when its idling really rough if i put it in neutral it idles better (not perfect, but better)

Any insight would be greatly appreciated!

 

Possibly a intake manifold Gasket. That engine had quite a bit of trouble with that going out and causing problems.

Welcome to Truck Forums.

 

gah i hope not. thats one of those repairs where its only a $15 dollar part but takes hours to do if ya dont know what you're doing...which i dont. This is my first chevy, and first 8cyl engine so a lot of this stuff is pretty new to me.

 

I can have the whole job done in about 45 mins. It's not that hard to do.

 

I would suggest getting the codes read. Try and find a place that can do a LIVE code reading too

It sounds like your truck is creating issues that are temperature sensitive

Please come back and let us know what you learned

 

X2 on what In2Trux said.
You have a CEL on, have the code pulled first.

Very common issue on those is cap/rotor corrsion internally.
Don't just throw those parts on it unless they are bad, you need the computer scanned.

 

The cel was only on for about an hour. Does it store old codes when the cel goes off? I tried jumping the two terminals but it didn't flash any codes.

 

I have never had any luck reading codes on anything. I don't even mess with it any more.

 

Your ECM will have a history. The technician can search throw the history to find related codes and faults

 

Those early ECMs don't store all codes.
Sometimes they only show certain codes while the CEL is on. When jumping terminal A-B on the ALDL if the CEL won't flash code 12 it indicates a bad ECM. That is assuming the data link has a good connection with the ECM.