2008 ford mustang
Had a broke valve spring number 6 had it fixed. The week started misfire on number 5 plugs wire coil pack injector used carb cleaner to check for vac leak still that same.rpm jumps up and down about 100 or so not very bad .and some times when i drive it for a wile it gets better any info on that o and new egr valve too and did compress on 5 and 6 145 on 6 and 129 on 5