Mercury Repair Questions? Ask a Mechanic for Answers ASAP
this sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.
If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,Ideally measure the pressure at the injectors and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
Thanks for the extra information
OK this sounds like the fuel pump isn't being held on by its relay
this relay is normally switched via the ignition switch and the relay held on once the engine is running
so I'd suggest replacing the fuel pump and the ECU relays that shoudl be located in the engine bay fusebox
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