89 s5 NA, car is completely stock besides RB exhaust (header back), 5th/6th port inserts, had good compression ~ 1500miles ago
still has all emissions, air pump etc.

been fighting issues with this car for a while, car was running/driveable but still had some idle surge issues that i was hunting down. Re-seated TB, TB elbow, intake hose & afm to address vacuum leaks and now the car does this:

Car revs to 5k on cold start, idle begins to fall, runs rough, then dies pretty quickly. giving some throttle will keep the car running in the 2-3k rpm range, but it sputters a lot, and back fires/pops some.

Fuel pressure is in the 33-40psi range (40 when it stars/revs to 5k, drops some when it begins to idle)

Tested AFM using resistance method from page f1-82 of manual...
e2-VC in spec ~285
e2-VS is in spec when full open/closed but seems to be all over the place.

485 closed

185-300 full open (number cycles)

sliding the cone/flap gives all kinds of random numbers, almost immediatly (5% open) jumps to ~1700(?) and cylces randomly with a low of ~600... no consistency, doesnt sweep, numbers go all over the place up and down as you continue to open the cone... is that normal? i expected the resistance to be similar to a TPS where it does a sweep.

 

also seems to run better without the AFM.

 

Make sure the AFM connection is a clean and solid one. And for the car to run w/o the AFM did you jumper the fuel check connector?

 

Make sure you reconnected all your vacuum hoses.
Try starting it in first to avoid the cold start up.

 

since this is how the thing actually measures flow, its resistance changes with movement. if you have a digital meter, it will be all over the place, an analog meter generally will be more stable.

when its running, try spraying around the intake with carb/brake cleaner, if there is a vacuum leak, when you spray in that spot the engine will run differently.

 

sorry for the resurrection, i am having a similar problem did you find the problem?