1990 300SL hard start warm

[fdm_alex]

Currently have a 91 300SL with the 104 CIS engine. Seems to start fine cold, but after hot soak it will start-stall and then have a long crank and sputter for a bit before working properly. Thought injector leakage or bad check valve. Connected to upper chamber pressure, holds fine after shutoff. Can't connect to lower chamber due to poor positioning of the test port, but when it stalls the pressure on the high side remains okay which makes me think that there isn't low side leakage either.

Though maybe vapor lock from bad accumulator, but that tests okay too. Disconnecting EHA doesn't help, nor does IAC. Looks like cap/rotor/wires are new, as well as fuel filter. I'm getting a little annoyed, can't find any recommendations on the forums for testing anything I hadn't already gone through.

Any help is appreciated.