Jim, does the engine rev up? If it revs up but you can't get good vehicle speed, try checking your transmission's cable adjustment, or transmission.
If your engine doesn't rev up at neutral, I'd first check the in-tank fuel strainer, then the pre-filter (small plastic filter before the pump), then the main filter.
These are a few basic things you can do prior to considering any repairs.
You can also check the fuel overflow valve which is located on the block side of the injection pump. This is a relief valve which controls fuel feed pressure to the pump. Valve could be stuck open.
Does your car perform perfectly when hot?
[This message has been edited by poptest (edited 01-08-2000).]