Probably emissions, possibly gas cap too loose. Auto parts stores like Advance Auto Parts can check it for free for you, but it's a good idea to get it serviced soon.
It should, the plugs for ecm are the same, you will have to take the ecm(located on passenger side fender) along to keep things tight(no check engine light)
Need more info!!!! Is the check eng. light on???What eng. is it??
Check the sensor located at the bottom of the reservoir.
check eng. light code 2716
Hans Eng died in 1995.
can be a multitude of things, if the eng. light is not on, start with checking the convertor.
5 qt. including filter
check the multi connector under the air filter they get water in them and corrode.
Repair whatever is ailing the engine. That light is telling you something, have the codes read and find out what it is and repair it.
Check this out :http://www.kaheel7.com/eng/index.php/astronomu-a-space/249-speed-of-light-in-holy-quran
what eng. do you have? if it is a 5.4 or a 4.6 it is under the intake manifold on the passenger side.
Is the light (check eng.... MIL on whening diag. says no MIL?