2000 Seville sts 4.6 I checked plug,wire they look good seem to have no vac leaks car runs really rough when first started and smoothes out when I rev it up once its warm you hardly notice rough idle nothing when driving still geting missfire code on #7 cyl any thoughts on a bad or clogged injector I really don't want to spend 200 bucks on a hunch that I might have a bad coil any thoughts thanks
Try some fuel system cleaner. It could be the EGR valve.
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