I have a 94 mercury cougar 3.8 ltr xr7, when i start it up the check engine light turns on and it runns real high and ruff, black smoke out of the exhaust, it wont shift out of i think 2nd gear ( no more then 40 mpg) im guessing it is a o2 sensor and i am going to hack a test for the check engine light, anyhelp?

it's running rich. black smoke out tail pipe?

Check engine light on?

You have a vacuum leak. Check PCV hose on passenger rear of engine. Stuck open EGR valve can also be the cause.

check air flow meter

My cougar does the same, it starts and then about 1 minute later (or so) the check engine light comes on and the car idles really high, with black smoke out the exhaust. It stays in second gear i think and it will not shift out of it. Max speed is 40 mph with the rpms screaming, it will go off after a long time but this is agrivating. I have a 94 mercury cougar xr7 3.8 ltr Any help please?

check pcv valve for failure/sticking

two people told me it was the egr valve
one guy said he replce the hose and it worked for him
I hope this helps

check all your vacuum lines for cracks and proper connections, (this sounds like a vacuum problem) good place to start..

Can you fix this my headlight blink off and on and i must hold high beam light switch on blinker handle to drive at night

The tensioner is not adjustable, the spring in it provides a preset tension, I don't understand what you did, but if it came apart then most likely you damaged it, buy a new one, if you get it wrong and it falls apart on the road you are stuck.

it depends on which letter is in front of the code
B1443 is door handle switch circuit open
C1443 steering phase Acircui short to ground
P1443 evaporative emission system control valve ( low / no flow )
hope this is what you ar looking for