Service engine soon light

[SVT Kev]

I have a 99 Cobra with 88,000 miles. Last night I was driving around normally, and the service engine soon light came on. It also has an occasional slight miss under load. Any ideas what could cause this. Thanks

 

[lemosley01]

Go to autozone and get it scanned to find out what the code is. That will determine where to start looking.

 

[SVT Kev]

The code came up as Misfire on #4. Is this probably a bad spark plug? What spark plugs are recommended? Thanks

 

[lemosley01]

I want to say auto-lite 764s are a good replacement. I believe those are stock heat range.

 

[stock svt]

might want to check the coil pack also

 

[Mach0ne351]

get the coil and plug. i would recommend going with the factory replacement plugs of motorcraft. you will not see ANY change in power or anything with aftermarket plugs, unless you are a supercharged.

-marek

 

[SVT Kev]

Thanks for the replies, guys. I put new stock Motorcraft spark plugs in. What a difference!! The old ones looked like they had been in there for quite a while. There is no miss, and the power is back. Thanks again.