'98 2.8 30v - 25% it will start right up no problems - the other 75% of the time the car will start but it won't stay running, I have to hold the gas pedal down to get the car to start and stay running...

Also - theres a very small black plastic hose that appears to run from the coil down the pass side of the motor, across the back, then back down the driver side before it joins a grouping of hoses and goes up into the fender well. This hose is broken at the corner of the driver side valve cover - looks like it was pinched if/when the valve cover gasket was replaced and it eventually broke...don't know if the two of these are related or not...

Thanks

 

Could be your vac lines, even plugs, or possibly a dirty MAF or TB.

 

Well I fixed the broken vac line and ran a can of seafoam through the gas tank but it's still doing the same thing...about the only time the car starts right up with no problems is after it's been sitting overnight...once it warms up it'll stall right after it starts...

fuel filter/pump? spark plugs/wires? I don't know...