Bought a z71chevy from Leland all went well friend...

Bought a z71chevy from Leland all went well friendly quick cash sale 3 months latter engine light went on,went off and so on, made appointment to check it, said it was a injector,but didn t know if my warranty covered it And it was a certified vehicle,extended warranty went home disappointed,lady at service couldn t help at all,go to cavenders in Boerne,horrible service in Kerrville,certified,plus extended warranty and didn t know if it was covered,after six hours they finally called me and said a fifty dollar deductible on the extended warranty will fix it