01 service engine light on

I have a 01 Grand AM SE 4cyl. The service engine light has been on from time to time in the 2 years I've had it. Sometimes it's on for a week then goes off for a few days, then back on for a while. When it's on, it idles a little rough, and very loud ticking is heard. I have had it checked and there is a miss in one of the cylinders. They changed the coil and nothing changed. Then I change all the plugs and the short wires, and still nothing:shakehead . I've basically payed $250 :2cents: for plugs and wires and have given up. Some have said maybe something as simple as a vaccum hose. I am trying to sell it, but it's kinda hard to sell with warning lights on! Any suggestions as to what this might be. :banghead:

Iam replying to my own message above. It is actually the service VEHICLE soon light, not service ENGINE light that comes on.

the only way to know for sure is to get it scaned with a scan tool!

The svs can be on for several reasons.
Even a headlamp out can throw the light.

Welcome to AF.