Try providing information, such as:
year, model, engine size, transmission (automatic? manual?) mileage, etc.
If your car is NOT a 95:
Go to Autozone
Tell the clerk inside that your check engine light is on, and he will scan it for free.
Obtain the 4digit CODE that he obtains (or codes!) don't rely on his INTERPRETATION.. get THE CODE.
bring the code back here, post it, and that will give us something to start with.
If your car IS a 95:
go to www.contour.org
click on "FAQ" on the left
click on "common problems" and go to "my check engine light is on".
find the instructions on checking your CEL codes with a paper clip.
Also, regardless of year, check your battery and alternator operation with a multimeter/voltmeter
Start the car, measure the voltage on the battery terminals. should be 13.7-14.5 or so. Shut the car off, and drain the "surface charge" by turning the high beams on for 60 seconds. now, with the car off, measure the voltage on the terminals. Should be 12.0 or higher.
