Well soldion.. MDK here. I've had more than a few of these..I started with a 1997 850Rwagon a millenia ago. If it was me I try this.. it's on rockauto with the info you gave.

Does this only happen immediately after getting gas? If so, is engine flooded ... is can you start the car if you floor gas pedal and crank for 20 sec?

I had above problem before. There is a vacuum switch that gets stuck open and floods engine while filling tank if it is stuck.

This is Dave Leach, who I know through Facebook. He's a legit guy, been selling these setups for years.

Registrant Name: David Leach

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