Greetings of all things my mother n laws 1999 mc , was driving fine then stalled, pull off side road then called me .when I got there it started and ran fine luckily I followed her about 2 miles it died again this time it wont restart so had it towed home the next day it starts and runs fine did this a few times during the day all good I get there that evening it start but had to play the pedal run rough at high idle but run then stalls with puff of smoke then wont restart. no codes , I unplugged MAF sensor while running idle came down and tried to run but still rough at low idle. I did change fuel filter.
can any one point me into the rite direction
let me thank you ahead of time Thank you Thank you


(changed fuel filter) cause didn't seem to have a lot of pressure at the relief valve

 

What engine ? How many miles ? How has it been maintained ? Serviced ?
What has been replaced or updated ?
Is it the original fuel pump ?
Filter was a good start...(Could be bad gas)
Bad clogged injector's ?
How long has she had this Monte ?
How long has it ran OK...
Did you look inside the MAF to see if it's clean/clear ?
Have you worked on cars before ? This Monte ? Is anyone in the family a mechanic ?

Post as much about the systems as you can & it will help our expert member's help.

Keep checking back (many member's take Sunday's `off)
Good luck on finding the problem

 

Check the fuel pressure. It could be the pump getting weak and going bad. Could be the MAF sensor also. Check for codes.

 

Ok sorry wasn't thinking its a 3.8 motor used put in by a shop awhile ago now don't know for sure of miles, its stumbled once or twice in the past but always cleared up till now yes I have worked on this one before on the security pass lock bypass I haven't gotten a fuel pressure tester yet but going to soon . I'm not a mechanic more of a parts changer but im not totally lost either. well till now. im firm believer in if it isn't broke don't fix it but don't like throwing parts at it that gets expensive hopefully this will help if I've missed something please by al means correct me

 

also no codes

 

Has the fuel filter ever been changed ?

Below is a vid that may help (or not)
Check it out `if U have the time >Good Luck<

 

Yes first thing i did, i can unplug the Maf and car will start and try idling not rite but try to,But makes a loud howling noise coming from the housing the sensor sits on connected to the air box
Plug Maf back in and it dies with a cloud of smoke .

 

That sounds like a MAF problem. A buddy of mine had a MAF going bad and it puffed out black smoke.

 

it might also be th e crank position sensor. If so, have fun pulling the balancer off.

 

Where is this loud "Howling" Noise coming from? How many miles on it?

If its coming from the upper intake... (the big black thing on top the motor)
It maybe time for upper and lower intake gaskets...

Plugging in the MAF causes it to huff smoke and it stalls...
Id definitely say the MAF needs to be replaced... be sure to only get an ACDelco Maf... all other off brands tend to fail (bosch etc) Our Monte Carlos work best with Genuine GM Parts.

Yes they cost a little more.. But its worth it...

If you buy the cheapo.... Youll be replacing it in a cpl months and then your savings go down the drain.