Car went crazy after being serviced HELP!!!
Today I took my car to a well known and very reputable shop to get my air/fuel mixture adjusted. It was previously tampered with and caused my car to run very rich. My car was put on all the specific computers and it showed my car was indeed running a little rich and had a slight rough idle. The mechanic adjusted it to spec and then my car idled smoothly and accelerated great. After reaching close to home(drove about 15 minutes) the car began to run weird. It hesitated really really badly and stalled a few times. I was almost rear ended TWICE because of this. It was as if the car began to run very lean. Well I called the mechanic and took it back to him. He then richened the mixture and now the car pours black smoke out the exhaust when I accelerate (like before).
Why did the car react negatively when the mixture was adjusted to spec???
I have replaced:
Cap and rotor
Plugs and wires
Cleaned idle control valve
All vacuum lines
What could it be??
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
Monochromatic Paint (Custom Blue)
Flat Badged (front)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS