[Stephens.sarah87]

My check engine light has been coming on and flashing. Rpms will go all over the place, hardly any exhaust coming out of the pipes, and it smells terrible. I have a 2011 slt1. Engine and alternator were replaced last year and are still under warranty. Please help!

 

[Grantv]

Get it scanned... only way to know for sure IMO. Possibly throttle body issue? MAP sensor?

 

[Stephens.sarah87]

I am trying to get a friend with a scanner to come tell me the codes its throwing out. I could even get it to turn over earlier, but tried again and gave it a little gas and it turned over, but shaking pretty bad.

 

[Grantv]

How many miles?

 

[speleos]

I am trying to get a friend with a scanner to come tell me the codes its throwing out. ...

Welcome to the forum.
Answers can be more focused with the additional information.

 

[electbc]

This light comes on during a malfunction in one of two ways: Light Flashing: A misfire condition has been detected. A misfire increases vehicle emissions and could damage the emission control system on the vehicle. Diagnosis and service might be required.
GMC Acadia/Acadia Denali Owner Manual - 2011 Black plate (19,1) Instruments and Controls 5-19
To prevent more serious damage to the vehicle: . Reduce vehicle speed. . Avoid hard accelerations. . Avoid steep uphill grades. . If towing a trailer, reduce the amount of cargo being hauled as soon as it is possible. If the light continues to flash, when it is safe to do so, stop the vehicle. Find a safe place to park the vehicle. Turn the vehicle off, wait at least 10 seconds, and restart the engine. If the light is still flashing, follow the previous steps and see your dealer for service as soon as possible.

 

[dhavi4226]

Flashing light, Don’t drive. Just as electbc said. Your friends scanner won’t help. Need a professional scanner. If under warranty take it back where you had the work done.

 

[jsr1947]

Had a similar issue some time back on my '09.. Intermittent misfires all over the place. Turned out to be the fuse box. Remember this, when you try to drive with misfires you're dumping fuel into your cats and they may be ruined.

 

[JayTee2019]

Had a similar issue some time back on my '09.. Intermittent misfires all over the place. Turned out to be the fuse box. Remember this, when you try to drive with misfires you're dumping fuel into your cats and they may be ruined.

Best advice . . . . and agree.
And dumping raw fuel into the cylinders which washes oil down past the rings and into the crankcase as well.

 

[Miltown414]

Had a similar issue some time back on my '09.. Intermittent misfires all over the place. Turned out to be the fuse box. Remember this, when you try to drive with misfires you're dumping fuel into your cats and they may be ruined.

What was wrong with the fuse box and how did you fix it? Thanks

 

[JayTee2019]

What was wrong with the fuse box and how did you fix it? Thanks

The fuse box in some years seemed to be subject to corrosion which resulted in intermittent or outright failure of some systems.
Here is a previous post of the member you inquired : -

2009 Acadia here. Many horror stories.. There are 2 separate fuses for 1,3,5 and 2,4,6. But I'm sure that's one of the first things you checked. I was on vacation a couple years ago and lost 2,4, & 6. I found that by going to a local Advance Auto Parts for a courtesy scan. I called my mechanic back homer and he told me to wiggle the wring harness under the fuse box. It worked on and off after that. Bottom line is that I almost set the car on fire by driving it with those multiple misfires. Of course I was dumpling fuel right into the cat on that side and that caused that problem. I Had the car towed in. It cost me a fuse box (common problem it turns out), a cat, and motor mounts my mechanic found bad. Yes, he showed them to me..