My 04 D2 runs pretty well except that it has started to run rough when I have the a/c on and come to a stop light in Drive. Seems to run fine otherwise and not throwing any codes. My mechanic just checked the plugs/wires/coil pack and all was well.

I'm going to spray the MAF with MAF cleaner this evening. I was wondering if there was anything else that I should explore as a cause/solution.

Thank you!

 

Hmmm... interesting. **Only** when AC Is on then?

Its *not* a crank position sensor, that is for sure.

I would have started w/ plugs/wires/coil packs on this as first step.

When you say run rough ... is it idling low, missing on cylinders... a bit more description?

 

Cleaned the MAF and maybe its better. We'll see this weekend.

Is not throwing a misfire code and drives fine. It just stumbles intermittently when I have my foot on the brake at a full stop.

 

vacuum leak ?

 

That's what I'm thinking. Not sure how chase that so I'm open to any ideas.

 

If it's only when your foot is on the brake them try plugging off your brake booster hose and see if it still does it. Could be a tear or something in your brake booster. Careful, you won't have power brakes with it disconnected.

 

Its actually running better this afternoon after cleaning the MAF yesterday. Headed out for a long drive on Sunday so we'll see how it performs. I'll provide an update. Thanks for everyone's help.

 

So far, so good with cleaning the MAF. No more stumbles at stop lights and throttle response much better. Might even have better fuel economy...