Mechanics

HELP

1999 GMC Jimmy • 99,000 miles

Hello I just bought the jimmy it run good for 2 weeks but one day it start buck really. So o change the gas fitter but it was not that I change the egr valve but was not that but when I unplug the egr value it stop bucking but its the car won't shift into higher gear so Idk if I should change the Catalytic Converter or something
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Fezuk
January 1, 2012.




Any codes in computer?

Tiny
Fixitmr
Jan 1, 2012.
P0405 Exhaust Gas Recirculation Sensor A Circuit Low P0406 Exhaust Gas Recirculation Sensor A Circuit High

Tiny
Fezuk
Jan 1, 2012.
Codes are erased and have not returned?

Tiny
Fixitmr
Jan 1, 2012.
I have a 93 Jimmy with a 4.3 vortec that is doing the same thing. I cleaned the EGR valve, OCV valve, and the idle air intake control valve and now it rarely shifts into overdrive. Runs a lot better and has more power but it rarely shifts all the way out. How did you fix it?
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Tiny
Johns93jimmy
Feb 27, 2013.

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