horrible shuddering idle

Car starts fine
Drives well
Shifts ok
No cel

However, at idle the car acts like its going to stall (occasionally does)
Just started yesterday. Going to upload a video of the shuddering idle to youtube. Will post link/try to embed here afterwards.

Seems like vacuum related, not sure.
Any ideas?

Thanks

Intake gaskets are most likely the problem.

Pcv and maf cleaning fixed this for me though.

Could be a bad coil. It won't set a CEL or a blinking CEL at idle.

Hmm ok
Thanks. Sounds like a place to start sniffing around

My car is doing the same thing. RPM's at idle just drop sometimes. It stopped for awhile & I spaced it, but it just started again. Seems to be some what common but a lot of different possibilities. Keep us updated

Got worse tonight!
Going to pick up O2 sensors and plugs tomorrow.
Driving the car makes me nervous. It dies during deceleration (in gear or neutral)
Dies at idle
**** this thing man... ughh

Did you clean the MAF sensor with the $8.00 can of MAF sensor cleaner first.

Then did you spray Carb Cleaner around the intake manifold to TGV's to see if the thin OEM o-rings are leaking ? that is the normal fix for these cars, when you see the new o-rings next to the old ones you'll understand. The o-rings are $20.00



There are a ton of threads about this issue.

Oh Yea, If you buy a front O2 make sure it's a OEM one, that's seems to be what recommended here.

or remove and clean the OCVs with a can of $9.00 brake clean and about half hours time, for both

some seafoam couldnt hurt

Originally Posted by stuck686

some seafoam couldnt hurt

Have you had any luck with this stuff?

^ I think a lot of us that have been around for awhile use it. It does what it says it does when done properly. pretty much a steam cleaning of all your upper engine parts and piston domes

Originally Posted by rob-2

Have you had any luck with this stuff?

I always use seafoam every oil change. But I've only used it through the gas tank. That method hasn't' fixed this problem for me. I attribute seafoam for helping keep my 93 Impreza running as long and well as it does though.

Originally Posted by Max Capacity

Did you clean the MAF sensor with the $8.00 can of MAF sensor cleaner first.

Then did you spray Carb Cleaner around the intake manifold to TGV's to see if the thin OEM o-rings are leaking ? that is the normal fix for these cars, when you see the new o-rings next to the old ones you'll understand. The o-rings are $20.00



There are a ton of threads about this issue.

Oh Yea, If you buy a front O2 make sure it's a OEM one, that's seems to be what recommended here.

Excuse the noob question... the hell is a tgv?

According with the service manual this are the possible causes:
in order :

- Electronic throttle control
-manifold absolute pressure sensor
-mass air flow and intake air temperature sensor
-Engine coolant temperature sensor ( only in low temperatures)
-Ignition parts (Ignition coil and spark plugs)
-Air intake system (air leaks in the intake system)
-Fuel injection parts (check fuel injectors, fuel pressure regulator and fuel filter)
-Crank shaft position sensor (ensure secure installation)
-Camshaft position sensor ( ensure secure installation)
- Oxygen sensor
- Fuel pump and fuel pump relay

Thank you everybody with help and advice!

Will keep you posted once fixed and what fixed it