Alright, I recently bought a 1995 Mercedes SL500 with 97,000 miles on it. Got new valves and all the engine harness (wires) redone using insulating tape, new spark plugs and all parts related. Car idles perfect and accelerates well, the problem comes when I press on gas pedal little too hard to the point when tires are about to lose traction, car shuts itself down. As well as when I brake. This is not happening all the time. I decided to test it, went on a "dirt" road and tried to spin the tires. It would not spin the tire with/without abs system, but instead car would shut itself down. Then when I put it in park and start it, it would start right back and so on. Also on freeway when there is little bumps and tires jump up and down (just a little) car would seem to almost shut down(loses power), but after giving it little gas while in motion it goes back in normal Not sure if this is related, but when I turn on the ignition in position 2, the tachometer arrows vibrates so to speak What might be the issue? Thanks in advance.