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2003 Volkswagen Jetta Questions

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I have a 2003 VW Jetta...when I turn on the interior console lights at night, the external lowbeam headlights go off....I can turn the brights on and they will come on
The heat still stay on o times
Tried switching the comfort control module, but it didn't work.
My Jetta loses power going up hill. The rpm goes down; car turns off. What should I do? Im considering calling the guy I bought the car from. I'm so frustrated n broke.
So I've had misfiring issues since I bought the car till now. Current issue I have now is semi responsive coil, firing.

I have replaced all 4 plugs, all 4 coils, and even all 4 coil connectors. 3 of the 4 are great and fire perfectly, however there is just 1 that cuts in an out, all the time. Sometimes it will start firing, so it runs on all 4, then it will cut out and then I'll be stuck running on 3. Any ideas on what's going on? Any insight would be appreciated.

Again I have already changed all 4 plugs, 4 coils, and rewired 4 new coil connectors, yet I still have misfiring issues. Thanks!
It has weak ignition spark
Will purchase rebuilt engine need price to install only
sounds only while car is moving in drive or reverse
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