degreaser or carb cleaner? Your two symptoms may not be related.

If he sprayed carb cleaner around the injectors that he introduced fuel which would fix both symptoms as squirting carb cleaner into the intake will get the engine running and let the engine run long enough for the fuel pump to build up fuel pressure.

These engines are vacuum sensitive. The best way to check for vacuum leaks is with a smoke machine.

Again, idle smoothness and startup are likely to be two different issues. The startup problem is likely to be caused by lack of fuel pressure hence accumulator.

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With best regards

Al