I am thinking of replacing the Air Flow Meter on my 914. The idle is rough and it tends to hunt for an idle speed.
I actually had a cheap rebuild done by a local German Car repair shop several years ago and they said I really needed a new one.
Consider that the car is 45 years old, has just over 100,000 miles on it and does not get driven much.
L-jet is dead simple. Rough/hunting idle is usually a vacuum leak or other false air.
As you say, 45 years old, I'd be going over everything with a propane wand to see if you can smooth it out by adding fuel near a leak. (Much more controllable than carb cleaner!)
We actually did the carb cleaner and replaced vacuum lines already. Most are fairly new.
Helped a friend working on one on a VW Quantum Syncro Station Wagon about years ago, we actually wound up making a cup setup to measure fuel out put while diagnosing the system.
Thats about all I can remember from diagnosing the thing.
Funny thing is he still has that car, but it doesnt have that engine anymore and it isnt a wagon anymore...
In reply to Apexcarver :
I have one of his ex-QSWs. Tell Doug that Pete says hi 
Regards the 914, I would be paying attention to the intake boot, throttle shaft bushing areas, and intake manifold gaskets/boots. (I assume the manifold is multipiece like an ACVW)
Did you check the seal on the oil fill cap? If I remember correctly, if the 0 -ring is bad or missing you'll have an erratic idle.
The seal on the oil fill cap has been replaced. I do need to replace the manifold boots. They look worn.
One thing that is simple is check all the ground wires on the engine , pull the wire and wire brush everything ,
but as you can see there are many places you can have a vacuum leak , plus the simple tune up stuff like plug wires , spark plug gap , and valve clearance
You'll need to log in to post.
