engine code

[ooraceredgt]

my check engine light came on yesterday and i ran an diagnostics on it. it came up with code 305 and i had 3 cylinders misfiring. the car seems to run fine up until the ses light comes on. the only thing it does when the ses light comes on is lose a little bit of power and also it seems only to come on when i drive it over 75 mph that i noticed so far. any help would be appreciated

 

[COramprat]

my check engine light came on yesterday and i ran an diagnostics on it. it came up with code 305 and i had 3 cylinders misfiring. the car seems to run fine up until the ses light comes on. the only thing it does when the ses light comes on is lose a little bit of power and also it seems only to come on when i drive it over 75 mph that i noticed so far. any help would be appreciated

Three cylinders or the No. 3 cylinder? Probably a bad plug. Pull the plug and see if it looks bad, or just replace it. Could be a bad coil but I would go with the plug first. Generally this is what would cause a misfire.