HELP! Engine Shudder!

[AtomicBomberMan]

I was wondering if anyone has or has had the same problem as me. im driving my car and every so often (cant pinpoint a specific rev range) it shudders. the pedal goes to floor, the engine splutters, but there is no power at all! this is only for a few seconds and then everything seems to be ok again. but sometimes it is so serious, i have to pull over. one time the catalytic converter light came on for a moment. its like a giant miss! originally i thought it was the afms, so i took them off and had them cleaned. but the problem is still there. i know i should take it to the mechanic. but was wondering iif i could fix the problem myself for the meantime. any suggestions? car is an r32 gtr.

[Sumo]

blocked fuel filter??

Sumo

[nismoman18]

yeah i have that problem too, only when i change into thrid gear at like medium speed. it just shudders then goes, i thought it could be my gear box or clutch, hell im gonna take it to a mechanic

[AtomicBomberMan]

Arrrrrrgh! help! i have taken it to the mechanic.... and you know the story.... the car is well behaved and cannot get the problem to occur at all. just now i changed all the spark plugs, from 6's to 7's. the car went in for a major today, and my mechanic (chapman automotive) told me that the spark plugs were ok. just to be on the safe side, if it were faulty spark plugs, i wanted a set i could changeover to. after changing them over. it drove quite nicely. but then, there it was. but this time, when it did happen, it was terrible. my car was crawling shuddering and spluttering all the way home. i had to pull over a few times. the car just wouldnt go! when i pushed the accelerator, it burbled thru the whole rev range. now when it sits, it idles nicely and then drops to the point of stall (but doesnt) and then idles nicely again! i am too worried to drive it anymore. please help! my mechanic is very far away! in this service the afm's were cleaned. so that eliminates that possibilty. please help!

[nismoman18]

Is the AFM connected properly? Is the mechanic trustworthy, couldve done foulplay with ur car so u bring it back to him and pay MORE money. It sounds like sumthing is leaking, loss of compression. get the timing checked, retuned etc.

[adam 32]

check all intake, fuelling and ignition systems

ie intercooler pipes + AFM

change the fuel filter

and check ur coil packs are firing and the ignition module is still functioning

[AtomicBomberMan]

if it is electrical, ie coil, spark.... shouldnt it happen all the time? the afms are connected properly. how do i check the coils? is there an easy way?

[Guest VuDuDoc]

bump

im having the same problem......what are the specs for trouble shooting the ignition module and the other stuff. you know the base Ohms and voltage output of the components that would cause the car to run like this.

[AtomicBomberMan]

vudu i cant answer your question, but my problem is fixed now. it WAS an faulty airflow meter after all. maybe you should give it a go.

[rb25]

or a bad o2 sensor? sounds like it goes into limp mode...