Lately my car has been staling briefly for about a second or so while I try to accelerate while at around 20-30 mph. I was told it could be the spark plugs (I have not replaced them for six year now) My mechanic replaced all spark plugs yesterday but sure enough the car stalled few times again today. Could it be my transmission? Help please! Thanks

 

Lol I don't see how changing the spark plugs would have anything to do with stalling. Fire your mechanic. Plugs probably needed to be changed regardless.

Does the car make any sounds or just stalls? Manual or automatic? Any whining noises? Clunking? Need to post more information.

 

Have the mechanic check for a stored error code.

I suspect the Accelerator Pedal Position (APP) sensor has gone bad, but not enough to trigger the Check Engine Light-- not unusual for a bad APP sensor.

 

Hi Jason. In deed the car makes a buzzing noise coming from underneath like a lose metal especially when the windows are down. The noise is so subtle you can miss it unless really pay attention. The stalling is feels almost like broken motor mounts but I just replaced all 4 about six months ago so it is probably not the cause. It is an automatic transmission. Thank you for the reply!

 

OP, exactly what plugs did your "mechanic" use?

As previously noted, could also be the APP sensor. Did your "mechanic" check for any stored codes?