98 K1500 missing after replacing spark plugs. Ran smooth before. Have replaced plugs again, plug wires, cap and rotor, fuel filter, and cam position sensor (computer showed 30deg mismatch between cam and crank). Plugs and wires replaced twice with no change. Odd that a fuel injector would plug or quit while changing plugs, but can not think of another cause. I have verified a strong spark at all 8 plugs.
Looking for any suggestion before R&R of injector assembly...
Also, the engine turns over VERY slowly and is hard to start. Battery tests ok, cables new. No check engine light or new codes.