I lost starting power accelerating power sound like its clogged up?

Hello, I'm unsure why the engine would stop cranking after the replacement of the spark plugs, but I bet that would be battery drain. It should idle below 1,000 RPM, at 1000 RPM idle, I'm already looking for vacuum leaks. For the main issue, you can connect a vacuum gauge to the engine, run the engine in park at 2500 RPM while watching to see if the vacuum slowly starts dropping. That tells you if you have a clogged catalytic converter.