I have a 2000 elantra it codes p1127 when the car excelleratrs it hesitates or drags ..the code says theres no vacume flow.the car starts up ok however if u rev the moter it will shut off when the rpms come back down. it doesen't seem to point to the idle control is it the vacume can or silinoid.also I'm getting a throtol position code as well can u help

SOURCE: saab 900 s

what kind of car do you have?
Is your car with distributor or electrical egnition?
the fuel pump is not the at fualt.
in your son car are only two common problems or electricity does not come. Or fuel does not come good like is supose to come.

SOURCE: 1990 Toyota Celica GTS. Idle races too high

sound very much like a vacuum leak.... also maybe your timing is off? possibly advanced? try retarding it with the distributor if thats the case...

SOURCE: car revs up whilst stopped, idle problems

you need a new oxygen sensor

SOURCE: '94 olds 88 error code 'hot...a/c disabled' -- Car shuts off

That is likely a ground problem.I had the same issue a few days ago with a customers car.See my response to another individual who has the same problem.It also did away with the hot ac-disabled problem and no more stalling.This might not solve your problem but I would seriously try it.

SOURCE: 1998 Hyundai Elantra, Code P1127

dear friend-plse look at the following:feul pressure,feul system,mechanical fault, ecm.these are all related to your problem.