Do you feel any pressure on your hand when you have it over the filler hole? If your car has a lot of miles, I am wondering if maybe the rings are worn to the point where you have excessive blow-by?

I think the vacuum hoses all have their source at the intake manifold. For most hoses, disconnect the hose at the intake manifold, cover the hole, and see if the car runs better. If it does, look down that vacuum line for a leak. For the Fuel pressure regulator vacuum line, shut the car off and pull the line off the regulator. Check if it is wet with or smells like gasoline. That would indicate a bad FPR.

See my previous post for how to check for leaks at gaskets.

I'll try to post the FSM page for '92 L27 rough idle for you.

i dont feel anything at all when i put my hand over. tomarow if its not snowing out ill check the vaccum lines. btw i doubt my rings are bad the car has 83k miles

I am just wondering what other paths there are besides PCV between crankcase and vacuum. I think maybe a lower intake manifold gasket failure might create a path between crankcase and vacuum.

Blow-by not likely with those low miles.

hey well if you think of anything just let me know

thanks

Some other things to think of:

hey thanks for the info ill check some of that stuff out. right now im furious someone stole my atv so im not as concerned about the car right now

well ive given up in finding my atv. im back to working on the car again and its supposed to be in the 60s all week. ive checked all the vaccum lines again and replaced them all this time to no avail. should i replaced my valve cover gaskets and my intake plenum gaskets??

First, you should review the page from the FSM that Bill Buttermore posted above. There are a series of items to check there before you go to replacing parts right away.

For example:
Did you check your PCM connections and grounds to make sure of positive and clean connections?

Did you do any of the fuel system checks? I.E. check for fuel in the fuel pressure regulator hose.

Let us know what other checks you have done other than the vacuum lines.

I would do the propane test for leaks before replacing any gaskets, and check the FPR.

fuel pressure tested good. all grounds are good.