I had an injector quit on me once. It just felt like a dead cylinder. Pulled the plug and it was dry and white. Tried a new plug for giggles but that didn't help. Process of elimination lead me to a bad injector so I replaced it. That was the fix.
92 Ranger--306, TFS wedge heads, TFS 1 cam, Explorer intake--Tmoss ported lower, 65mm TB, Powerdyne blower at 6 psi, 42 lb injectors with matching C&L MAF, Custom tune, Mustang motor and trans mounts, Explorer accessories, Kauffman long tube headers, Volvo electric fan, AOD, 3000 TCI stall, B&M shift kit, 8.8 rear with 4.10's, fabbed traction bars, BII fuel tank swap