2005 audi a4 quattro 1.8t rough idle cold start

Asked by Nov 12, 2016 at 01:39 AM about the 2005 Audi A4 1.8T quattro

Question type: Maintenance & Repair

When I start the car on a cold start the rpms
will jump up to the 1200 rmp high idle like it
should but then they begin fluctuate up and
down until the car is warm. After the car is
warm it will start right up and run like a new
one unless you let it sit long enough to cool
down and the start be classified as a cold start
again.  I do my own mechanic work and can do
just about anything on any car. I have replaced
the fuel filer, coils, valve cover gasket, coolant
temp sensor, checked for vacume leaks, clean
MAF sensor, cleaned the throttle body, cleaned
the air intake sensor, replaced old vacume
hoses, cleaned electrical plugs,and probably
more I can't even remeber. It is getting the best
of me. I have checked every sensor I can think
of and I still cannot figure it out. I am up for
anytype of suggestions.  

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