Posted by Steve@Advance on June 04, 2016 at 12:07:12 from (107.203.134.67):
I recently bought a 2014 Silverado 1500, 5.3 engine, 43,000 miles.
It ran good when I bought it, but now it has developed a mid range stumble and intermittent rough in gear idle. The stumble feels like lean mixture, driving in the 50 MPH range, try to slightly increase speed, it tends to stumble. Trying to drive a steady speed it wants to fall off, then push the throttle a little, it picks up too much, like it wants to run any speed but the speed I want to go! LOL
This has the V8-V4 system, but watching the dash indicator, when it switches back and forth does not seem to be associated with the stumble. Watching the average MPG, it's very unpredictable. One time I look at it, it's showing 13 MPG. Drive the same route, same conditions, next day it's showing 17!
Seems every theory I try to pursue hits a dead end...
Fuel filter: Doesn't have one that I can find.
Fuel pressure test: Can't find a port. No fuel rails visible, evidently everything is under the intake plenum.
EGR valve: Don't see one... Is there one?
MAP sensor: Don't see one.
Haven't looked at the plugs, but they are supposed to go 100,000 mi. I'm getting no codes. I've looked on Youtube, nothing for that late model, just the older stuff. Looked on the forums, no success.
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