Truck stumbles

[Talisman]

My 97 vortec 5.7 K1500 stumbles at partial throttle. WOT and idle seem fine.
DTC's reported:
P0102
P0300
P0399
P1345
I did un plug and replug the MAF to see if that changed the stumble but it didn't.
I also unplugged and replugged the sensor on the bottom front of the motor to make sure it killed it. Crank Position sensor I think?
Still running first set of cap, rotor, and coil.
151,000 miles.
Ideas?

 

[Aloicious]

151000 miles on the original cap and rotor? holy crap, change them ASAP....fuel filter too, spark plugs, wires, etc....just do a full tune up would be the first thing I'd suggest

 

[Aloicious]

also some of those codes are not related to a tune up
P1345 is an incorrectly set distributor position
I don't see P0399 being a valid GM code are you sure its P0399?
P0102 is a MAF code, unplugging the MAF and plugging it back in won't do anything, pull the MAF off and look at it, it may need cleaning, or replacement.
P0300 is a random misfire might be related to the tune up, or many other things...

 

[Talisman]

Doing the tune up, but I think P1345 is my main concern. dizzy hasn't been pulled on this truck

 

[Aloicious]

the hold down may have gotten loose or something...its hard to say...its also possible you've got wear on the distributor gear, it doesn't normally throw THAT code for a worn gear, but I've seen stranger things happen.

 

[1997chevydriver]

the hold down may have gotten loose or something...its hard to say...its also possible you've got wear on the distributor gear, it doesn't normally throw THAT code for a worn gear, but I've seen stranger things happen.

Mine set that code for my worn distributor gear

Sent from somewhere in MN

 

[Talisman]

I'll probably swap in a billet distributor along with the tune up then

 

[Aloicious]

right on, make sure you get the offset set correctly when you reinstall the new distributor.

 

[Talisman]

Planning on following your write up!

 

[Talisman]

Well swapped in everything new (plugs, wires, cam sensor, cap, and rotor) and still getting a misfire. Code 1345 went away for a bit but hit again tonight.
Anyone ever used this ebay billet dizzy? http://www.ebay.com/itm/BILLET-vort...Parts_Accessories&hash=item4aa58f4f98&vxp=mtr

And if I'm able to put the teeth back in exactly how they came out will I need to do the live timing learn? If this relearn is needed for the new cam sensor do I need to try that before getting a new dizzy? Just done with this and ready to have my truck back to normal....