Hey guys background my mcs 06 has 105k I've owed it for about 3-4 months . Had no issues with it first couple of months but for the past month about once a week I've experienced a engine stall when coming to a full stop and today for the first time engine stalled as I was rolling into parking lot. I've always had issues with slight hesitation during first part if acceleration and past couple weeks I've been getting little stumbles during acceleration it doesn't seem to matter if it's full throttle or just casual. The rpm it happens seems to be random but always happens most of the time in 2nd gear. Any help would be appreciated.

 

Consolidated from cross-link:
https://www.northamericanmotoring.co...nal-stall.html

While I can't help you directly with the problem, start reviewing some diagnostic basics around how the engine works: Fuel, Fuel delivery, Spark, Air

Fuel:
is anything different about the gasoline?
any idea if the fuel filter has ever been changed?

Spark:
was weather/rain occuring around the same time?
how old or how are the conditions of the plugs & wires?

Air
SC boot condition, SC intake cracks, bypass valve spring

I'm sure others will chime in with some help as well.

 

Hiya.
I had a similar problem with my Justa with 160k miles. Stumbles at any acceleration, sometimes near stall, but esp when starting from a light after idle.
I found my air filter almost completely plugged. I decided to replace the four plugs and found one the electrode was almost gone. Replaced them all and got a air filter and I have a new car again.
Your mileage may vary , but worth checking. You can do all this yourself in a half hour. And if it doesn't work you can scratch it off the lidy of possibilities.

 

I use a alta foam air filter just got a new one and was just cleaned. The hose last month that runs from intake to valve cover was replaced but didn't seem to affect anything.

When I first started having this issue I checked the plugs. They looked pretty old and we're the bkr6quep ngk plugs. I have a 17 % reduction pulley and had read I would benefit if I went to colder plugs so I instead thr bkr7quep instead not so convinced this helped any since now when I do a rev at idle I'm getting some backfires. Which means I'm running rich at idle and getting waisted fuel sent to the exhaust.

Weather conditions are normal as usual here in Ga Humid and hot not sure if this is a factor or not. I may try changing back to a new set of the hotter plugs and see if it makes a difference. Supercharger sounds healthy as far as I know nothing that sounds out of place. I also just changed the serpentine belt so I don't have a belt slipping issue.

 

FYI: They're not backfires... they're programmed into it... we call them "Pop and Burbles".

 

Hmm.. odd it didn't do it before going to the colder plugs

 

Keep the colder plugs, don't go back to normal ones.

Check the condition of the wires.
Consider changing the fuel filter (there are DYI's)

Have you pulled any codes?

 

I'm not getting any check engine light so would there be any codes to pull?

I will pull the plugs and see if they are good or not. I had the fuel filter on my list. I will try replacing that in the next day or so and see if conditions stop. I thing the wires are ok but if the filter doesn't fix the issue I will try replacing those as well.