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Lost a full day's pay on a stubborn injector because I skipped the basic test first
Had a 6.7 Powerstroke with a rough idle, and I jumped straight to pulling the injectors thinking it was a bad spray pattern. Turns out the whole issue was a $20 glow plug module, and I wasted 8 hours of labor I can't bill for. What's the most basic check you always do now before you start pulling parts?
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