The car has know power when I give it gas. What might be wrong? Mechanics keep telling me different things I might need to change? They tested it and the say no error codes are comming up. Can you help out? Thanks

Especially helpful if you have annual emission inspections. The diagnostics tell you if all the emission monitors are functioning, and if any codes are stored in any of the modules or computers on the car. The more expensive and sophisticated scanners are bi-directional. they can command switches or solenoids, things like that, and see if different engine systems are working properly.
Or you can put the key in, start it and run it and follow the maxim "if it ain't broke, don't fix it".

Was the alternator bad or going bad. Changing that won't change it starting. Just charging to keep running. As I tell others you need 3 things to make it start and run. Good battery for the starter. Fuel and spark. Test for gas and spark are needed to know which is not working. Did you run it out of gas would be my first guess

Starter cellinoid ?

Well fred the thing to do would be to voltage drop test the electrical circuit an test to see how much current is being pulled on the circuit ! Do you own a DVOM - digital volt ohm mete , do you know how to use one ? Also check where the relay plug's into , does the relay box look burnt ? High resistance ! Check to see if the relay fit's tight . . Electric Testing Techniques You Need to Know
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

http://www.bbbind.com/free_tsb.html you can find free wiring diagrams here .

No it is impossible to say without testing the vehicle and doing a complete analysis with the correct diagnostic equipment.

These vehicle have numerous electrical faults that sometimes the VW dealer service centres cannot diagnose. What has been happening to you is the mechanics have been guessing what the problem is and just changing things without really identifying the actual cause - as you have now found. These are very unreliable cars so do not be fooled by the "german quality" label that people frequently and wrongly apply to German cars.

If you want and need a reliable car I would recommend you get rid of this Golf and get yourself a Mazda (and have any prospective used car thoroughly inspected before biuying). If you keep the Golf I guarantee it will give you much grief and cost you plenty more repairs.

I believe you should just set the idle higher at the throttle body or MAF so it gets enough air and fuel to keep running. Those butterflies have to be cracked open a little to start with so it's getting enough air to run without you having to keep your foot on the throttle pedal.

What you need to do is pressure test the cooling system, that will show leaks. What does happen is you get a leak, and do not notice it, then you develop another one or two, and when you fix the first issue, OTHER leaks show up. << Common thing.
Pressure test, if the rad leaks, replace it, pressure test again, repair what shows up, if anything...You need to be able to hold pressure to keep from overheating. It works like a pressure cooker, you can exceed boiling point with pressure.
This is why you should NEVER open a hot cooling system, it often will violently overheat when pressure is released.
Doc

sorry in order to help you have to know year, engine size, 4, 6 or 8 cylinder. then i can help you. Thanks

Grinding sound ? May be worn brake pads, down to the metal against the rotors. Vibration, could be a warped rotor, wheels not balanced, worn outter tie rods. The ABS light will come on if the tooth ring is broken, giving you a pulsing pedal. That is what the ABS does.

Your DPFE sensor may need replacing.

I had to change mine , the part cost around $200 and for me , my sensor was firewall mounted so it was easy to do myself, two screws,two vacuum hoses different sizes and three wires. I suggest doing research on line regarding the sensor and where it may be on your car. I have a 01 Focus se 2.0 spi.

I am always telling people to obtain their own HAYNES repair manual due to the $$ that could be saved by doing some things yourself, or at least having some knowledge so some mechanics won't think you're an easy cash grab. Some mechanics tell me the book is **** but that is not true; it's always better to know how cold or hot the water is before jumping in....right.?!