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My Jetta has a very rough idle when I first start it up. The colder the temperature is outside the worse it gets. The check engine light is on but I did a cat delete awhile back. I had assumed that it was the MAF but I just replaced it with a new Bosch from ECS with it doing the same thing. Trying to figure out what the issue might be. Here's a list of the aftermarket stuff. 2.5 DP with no cat Megan Racing version, 2.5 in cat back exhaust, and a K&N drop in air filter. I do not have access to someone with vagcom. Trying to find someone with it in my area but no luck so far. Engine is a 1.8T AWW engine code