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A good place to start is the brake light switch.
There are 2 circuits in there: 1 for the brake lights and the other for the car computer (ESP, Engine brake etc...)
If the brake switch has an intermittent fault, the EPS light may come on and the car may run rough until you stop the vehicle and remove the key. It then re-set itself until the next time you are using the brakes and the fault appears again.
It is an interference engine and you will have bent valves . That will be the cause of your rough engine and lack of power. To test have a compression test done first before pulling the head
It could be the ignition coils, but not very likely because there are 6 of them and usually only 1 or 2 will fail at the same time. The car would still start but run a bit rough. Get the computer scanned with a VAG-COM (you can find a shop that will do a scan, or take it to Autozone- they will sometimes scan for free) and see what errors are being thrown
How slow? Like un-driveable slow? Or just a bit slower than normal? Is the engine running rough? Are the RPMs going higher than normal but the car going slower? Not mush to go off of here but it could be anything from a bad transmission, MAF sensor, fuel pump to a sticking parking break. Add some more detail and we can try to give you a better answer.
The service light means your cars computer sees a problem, you can take it to just about any local parts store and most will check the codes for you for free and give you an idea of what is going on. by what you are saying it may be an electrical problem.(rough guess with limited info)
I would check to see if the catalyic converter is clogged. Drop the tail pipe at the manifold. Start and drive it for a block you will be able to tell real quick. It should run smooth and have good power. It will just be noisy. Or you could have coil problems.
Sounds like the alternator is badly damaged. The alternator will drain the battery if the regulutor or diode assembly goes out and/or the alternator is seized or locking up, which will cause the smoke (belt slippage) and drag on the engine (rough idle).
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