New plugs cleaned throttle body
Since the engine light is back on the code is likely to help you diagnose the problem.
1. If you have a code reader for your car plug it in and it should tell you what the computer thinks the problem is.
Remember for the engine to miss it has to be loosing fuel or spark. The spark plugs are only one of the parts required to make a reliable spark in the plug as the engine is running.
2. Check the spark plug wires and the distributor internal for rust contamination around the reluctor magnet area. The 4.3 chevys are bad for this. Have someone start the car for you at night while you look under the hood for spark leakage. In the dark any wire leaking spark enough to make it miss on acceleration will flash blue lights in the dark.
3. Replace the fuel filter.
4. Check for vacuum leaks in the rubber tubing plugged in to the intake manifold.
5. Make sure the battery to engine ground cable is in good condition at both ends and tight.
6. Make sure the battery to chassis ground wire is connected clean and tight.
Good luck.
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