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Message: <blockquote data-quote="94svtturbo" data-source="post: 855633" data-attributes="member: 11917">So last night i fired up the car and it was idling really rough and had some minor backfires. I though it was cuz i went another step colder on the plugs. But when i got up this morning and changed went to change the plugs back to what i had in it before all the plugs look like they are super clean except for Cyl. 4. Its totally black!!! but i went ahead im put the new plugs in. started it up and im having the same issue! so i pulled the cyl. 4 plug and its completely black again. the other plugs look brand new. Both times the car only ran for 10 minutes. also tried changing ou the cap, rotor, and wires to rule those out. the problem still persistsWhen i drove the car over to my buddys garage it drove perfectly normal!!! all I did was change the plugs, put in a Griffin radiator, ceramic coat my exhaust, and tuck the fuse block and wiring harness!! IDK what to check!!! any ideas would be awesome!Car is a 1994 Cobra 5.0</blockquote>