Shop Upgraded Injectors to new style now truck upshifts early at WOT

[socal k1500]

Got my truck back from the shop after they upgraded my injectors and the truck was driving great at first but then randomly on my way to work the next day it started doing this thing where if i take off from a stop it just seems like its shifting super early and putting my foot to the floor does nothing i get no output change from the truck, Its still accelerating just at really low rpms like its driving in OD?

1999 suburban with 5.7 vortec

 

[WICruiser-97]

Sounds like the transmission shift cable became disconnect. If the shop did not get it snapped back on securely it could have popped off while driving.

 

[Scooterwrench]

Take it back and tell them to fix it!!!

 

[Scooterwrench]

Sounds like the transmission shift cable became disconnect. If the shop did not get it snapped back on securely it could have popped off while driving.

I don't think they had TV cables in 99.

 

[socal k1500]

Take it back and tell them to fix it!!!

Im planning on it, just wanted to see if anyone had experienced this before, i need to drive the truck back to the shop from my work and was hoping it would be something easy. But its definitely going back to them to figure out

 

[socal k1500]

I don't think they had TV cables in 99.

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These codes popped up, truck is idleing rough too. If my co worker pointed out if do the injection system upgrade to the new style you dont need a new fuel map / tune?

 

[socal k1500]

ok just want to post an update for anyone who finds this thread later, the shop looked it at for me and it was the TPS sensor it was bad, spring was not springy at all. When they replaced the injectors it was probably ready to go and that much pushed it over the edge.

 

[GoToGuy]

Could you let us know the repair and final outcome?

 

[socal k1500]

Could you let us know the repair and final outcome?

Replaced the TPS sensor and it drives great, no issues, rough idle gone and no codes so far.

 

[GoToGuy]

Upgrade works good ?