completely lost need some serious help with idle and low power

[tim88325is]

I would still do it, the fact that the head was rebuilt even lends more to a valve issue.

Also, what issue caused you to rebuild the head?

I don't see it much on this forum but more old-timey mechanics will do a compression test with nearly any new problem to rule out serious problems and create a base line to work from.

[bmwcarnute30]

Ever do a compression and/or leak down test?

i just rebuilt the head and the engine was at 90 original miles i doubt that is the problem as the car wasnt running this bad before i pulled the head.

[tim88325is]

Ever do a compression and/or leak down test?

[bmwcarnute30]

i scanned my car for codes and im getting 1 code for icv. If i replace it i find it unlikely that its my only problem. Thoughts? also anyone got a t shaped ICV for sale

[bmwcarnute30]

so guys i was having a lose of power and idle issues. I own a 1990 325i vert. To start this off i will make a list of every part i have replaced.

Replaced with new:

Distributor cap
Rotor
Ignition wires
alternator
battery
oxygen sensor
MAF (with known working)
timing belt
head gasket
vacuum hoses (eliminated any leaks)
Brake Booster (had internal vaccum leak)
water pump
airfilter

Parts ive cleaned:
MAF
ICV
Had intake manifold sand blasted inside and out
Fuel injectors


THE PROBLEM!

the problem i have been chasing is that ive had hard cold starts but once its warm is will idle fine but if i give it gas it
will sometimes hesitate but then rev up nice a clean but once i let go of the gas and the rpms go down it will dip below
idle and either stall (most likely) or stutter and catch its self and continue idling. i also notice a large loss of power.

please let me know on your thoughts and if im missing some information just ask and ill give you what i know.