1) I just got the P0301 misfire code yesterday and got the car home on three cylinders. I ordered an ignition coil because it was raining and I figured it got wet. Think this will solve the issue? I had a studder in the car before this but it never tripped the CEL. I also had been running the car with a homemade crankcase ventilation tubing and I'm thinking it might be worth paying a shop to go back to stock. I really want to fix the studder, theres a leak in my catalytic converter too could this cause the problem?

2) Keyless entry buttons work but doors do not lock and unlock. I get the blinking red lights when I press lock button. I also hear buzzing in the trunk when I hit the unlock. Is this the door lock vacuum pump that is broken?

3) Recently replaced two spark plugs but I want to put in new ones to eliminate this as a possible problem. Is there a recommeded one for this car?

4) I have the lower grade audio system in the car and want to upgrade while keeping the look stock. Is it possible to hook up a Bose system from a different car?

5) Tiptronic is not working, I'm suspecting that infamous missing magnet. Anybody know where you can buy the magnets aftermarket?

Thanks

 

Year? Engine?

 

99 b5 1.8T Quattro w/ AEB engine

Thanks

 

Spark Plugs: NGK BKR6E. They're a copper plug so they'll foul sooner but they're very cheap and the copper dissipates heat faster than iridium so that will solve pre-det problems that may be causing your stuttering.

Fix the crankcase vent. The engine will always work best when its not made up of "homemade" parts. As for the cat, its possible your 02 sensor is getting a bad reading and could cause some havoc but I'm not totally sure about that.